Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3aa1fbab0d77d3…

MALICIOUS

PDF

42.5 KB Created: 2020-07-10 13:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 8415e5fa7cef548d1a9f958c00da3952 SHA-1: 64c5c2cea78d61b977de6539af5fb86a11073f27 SHA-256: ff3aa1fbab0d77d395440df529c9f7b27b637760475a79289c1d25ed43292238
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm designed to manipulate search engine results. The primary malicious link identified is https://ttraff.ru/wb?keyword=coronary%20arteries%20anatomy%20pdf, which is flagged as a malicious redirector. The document body itself contains garbled text and some of the extracted URLs, reinforcing the malicious intent.

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.ru/wb?keyword=coronary%20arteries%20anatomy%20pdf In PDF document text
    • http://files.wiltonneighbourhoodplan.info/uploads/1/3/1/6/131636995/zilelatisad_rojirogixi_xirude.pdfIn PDF document text
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdfIn PDF document text
    • http://files.salomearchitect.com/uploads/1/3/1/8/131857655/dagavokafum-barutetirux.pdfIn PDF document text
    • http://files.tinagutierrezartsphotography.com/uploads/1/3/0/7/130775383/remax-taxopugazaledu-fuluxibejurifuj-lavosiraleset.pdfIn PDF document text
    • http://files.advancedanaerobics.com/uploads/1/3/0/9/130969555/davam.pdfIn PDF document text
    • http://files.whalawoffice.com/uploads/1/3/0/8/130874432/nedubatija.pdfIn PDF document text
    • http://files.ornamentsofexpression.com/uploads/1/3/1/4/131455883/vojosa.pdfIn PDF document text
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://janavitim807994190.files.wordpress.com/2020/06/99866607762.pdfIn PDF document text
    • https://suzinupil.files.wordpress.com/2020/07/57311497527.pdfIn PDF document text
    • https://vugerudima.files.wordpress.com/2020/06/gawobogaril.pdfIn PDF document text
    • https://tobedubokigu.files.wordpress.com/2020/06/47288209763.pdfIn PDF document text
    • https://nojurofezep809160310.files.wordpress.com/2020/07/55217772219.pdfIn PDF document text
    • https://rekogexal.files.wordpress.com/2020/07/69015237482.pdfIn PDF document text
    • https://saxerigokej.files.wordpress.com/2020/07/85260202350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/lobuzegegamojum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/5444270165.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000688d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x688D 5068 bytes
SHA-256: e4fdce266f59c394f9f0c83636f926fa04415aa409da0b04feafcda9dc8da6e4
font_01_sfnt_off000079b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 10384 bytes
SHA-256: 28d601f5c6c147688c726935af5b3d1b7cbd43b7a06f39aa7cd37b7da85bdc87