Malicious PDF — malware analysis report

Static analysis result for SHA-256 1304c032c12fb892…

MALICIOUS

PDF

41.3 KB Created: 2020-08-15 23:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea6f9b47b9819b1943670c7786964db7 SHA-1: 418f8119fdd82fa6c9c36972eaadaeced37a85ea SHA-256: 1304c032c12fb89216f126caf1f151ee4844ee9053bbb7fb7628cfbe1e925f5a
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its redirection to a known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'Liver cirrhosis notes pdf'. The presence of numerous external PDF links, many pointing to Shopify domains, indicates a link farm strategy to potentially improve search engine ranking for malicious content. The primary IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=liver%20cirrhosis%20notes%20pdf
    • http://mutixidol.thoughtprovokingmomentsblog.com/uploads/1/3/1/3/131383839/borane-koxefujubu.pdf
    • http://bezoxoteb.thenostalgicmouse.com/uploads/1/3/0/8/130814328/79efb877073.pdf
    • http://files.hollykherndon.com/uploads/1/3/2/6/132683228/nidekobunezum_fawewobazoxi.pdf
    • http://files.thearborsatparsippany.com/uploads/1/3/2/6/132695405/muwawakotojuzu.pdf
    • http://tozoxuj.englishinisrael.com/uploads/1/3/0/7/130739344/0e4c67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4749/2506/files/88810592549.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/34685422022.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/tutiriwopavexifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/simple_and_clean_lyrics_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/4322/5751/files/revipifurunuxovuxupavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/ripozezumezibobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/account_receivable_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32808714247.pdf
    • https://cdn.shopify.com/s/files/1/0434/8870/6717/files/adverb_clauses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7696/files/pupitezezepanudikowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/relutunefoxumuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/lifuzemuxabakawuvagibabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/71230495509.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006527.bin
0be7cd8ca6f927b89b510a25e94a8fc52234728d23f7338e91946a977011cc37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6527 5004 bytes
font_01_sfnt_off0000762a.bin
af27907705c772fbda36d014824f9d04063affa80d01a9e5e187b4652486f136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762A 10000 bytes

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