Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91307178dd66c28…

MALICIOUS

PDF

41.9 KB Created: 2020-10-26 20:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2101b88bde1ecdc9ddf70e087452c505 SHA-1: 32800b40e9d0ee61ee990a7b71506903cbb8624b SHA-256: a91307178dd66c2857cd8df4cb25d657f8f6fc81e73902692b92ad3dc3b1800f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to redirectors and SEO link farms, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.link/123?keyword=pb+and+j+otter+disney+plus In PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/1261948.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/gedaturotelo.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/831ca38cea.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/3222900.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/muzaxupuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/panokojol/encyclopedia_brown_and_the_case_of_the_secret_pitch.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/84573459702.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/xuzowikumozesitegi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/wevirevuku.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/72043138153.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/mexuxofosudominamiko.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/jalixupomalakujaxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/ramolaxewesojivusajakuk.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/45286407712.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/kasowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1112/files/names_of_rivers_in_the_bible.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/free_download_security_apps_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6515/3942/files/mookambika_stotram_in_kannada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2879/3512/files/xijotosaf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000647f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 5272 bytes
SHA-256: be65fda7b9134fb3b28463cee8804715d1072d8c16f960f7350ecff19b6e5700
font_01_sfnt_off00007678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 10808 bytes
SHA-256: accabae60fbdf44cb9f398e4e4293280e34d247157356b909f3594146e4b8598

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