Malicious PDF — malware analysis report

Static analysis result for SHA-256 933a2ac4d7c048c8…

MALICIOUS

PDF

43.7 KB Created: 2020-11-07 15:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d90308885158efd4eee531f2ca53a1b6 SHA-1: 1c6b38d517040a23c66c4768a75b298e0d9f4d08 SHA-256: 933a2ac4d7c048c829f735888415f30b0b31f2090558de3edccb6c042335abc8
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure like 'traffmen.ru'. This suggests a phishing or SEO spam campaign designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including a specific redirector URL, supports this assessment. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

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://traffmen.ru/123?keyword=smithfield+middle+school+bisd In PDF document text
    • https://rimususoku.weebly.com/uploads/1/3/4/5/134587725/wewerin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5f9ae1794a60a.pdfIn PDF document text
    • https://jemodenot.weebly.com/uploads/1/3/4/5/134528334/9e6abd42e99c.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/lokefixana_lumivirusa_nisem.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/6277688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_5fa624519438c.pdfIn PDF document text
    • https://funiwulew.weebly.com/uploads/1/3/2/8/132814073/gotexiwodeguxu.pdfIn PDF document text
    • https://rafunegax.weebly.com/uploads/1/3/4/3/134350232/196ff9388913f.pdfIn PDF document text
    • https://jedotulaxadetin.weebly.com/uploads/1/3/4/5/134587896/gegaroseruzumip.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://s3.amazonaws.com/tabobujimo/different_phylums_of_animalia.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/xujamizalibakitarokate.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/mabakudesabibox.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/zurujodavulusowo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/conserv_refrigerator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/84084681068.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/jiddu_krishnamurti_books_in_telugu.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_off000061e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 4880 bytes
SHA-256: 98f046980392723078fd893519462045ad3489375c070a438a53fdaa111a500f
font_01_sfnt_off00007279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7279 9764 bytes
SHA-256: 78b1d499a64c21987e8b27df65b777a02d948f705e9478720ba2e8708050a283
font_02_sfnt_off000093fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93FE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.