Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f58a601c25db895…

MALICIOUS

PDF

48.6 KB Created: 2020-10-26 06:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7b372139b9dfd2af41213cc72c5346fe SHA-1: 9489125b43b9298d13c3ba4ce029108803719d5e SHA-256: 6f58a601c25db89595de32d25f9aec39bbf4b5bda1b2d179c549a33ded3aedcb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure for a 'Google assistant apk' download, which redirects to a malicious URL. The presence of numerous external links and a call-to-action button suggests a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the embedded URL is known to lead to malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/123?keyword=google+assistant+apk+for+android+4.4.4 In PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/duvudijowi_zopopafumo.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/wupizewezasedij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f9161d2961bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f8ec108ae473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f9274649ab29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f8fe1472b1f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8899a35fed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f8711beb747e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f871cbb2c724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3fdf6f90-6bed-4f37-896b-b4283a279453/54435136188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57941222-db7d-4a1a-bb85-e843c339db86/gekutefizadama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f90b22e-10ec-4007-8fb9-6a203ac5b73a/sawosarivupobumojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09e0afc-0e92-4eea-8802-879e694d29a2/48358363059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2774/0827/files/mapa_turistico_puerto_vallarta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2549/0332/files/penevesutipedutirogipifor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5034/3844/files/47710420876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6369/7817/files/wayside_elementary_school_bakersfield_california.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8276/0601/files/63182681465.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/loksatta_epaper_nashik_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/recirculating_aquaculture_system_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/70677155238.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/centrifugal_compressor_surge.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/brunner_and_suddarth_latest_edition.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 5212 bytes
SHA-256: 7854e552e69f38544a150eb785655ef1f2f428c33fade90d709054ee68ceaf1b
font_01_sfnt_off00008013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8013 11464 bytes
SHA-256: e55ccea70f8bd348bde95fcf2ebfb92a84f9ca38218d7c9b6eeafd2ff146cc47
font_02_sfnt_off0000a6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378