Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b635ec94bf175c…

MALICIOUS

PDF

41.7 KB Created: 2020-07-16 15:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcab38b38eea3139f5cd6f9d5f92aad7 SHA-1: 8fde52668b031ed1fec9225d022788e5da32347d SHA-256: 67b635ec94bf175c93f6d61323112b20e12b71ce71c771c6d3977fa6e4f1275a
154 Risk Score

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 or potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://ttraff.com/wb?keyword=ready%20for%20first%20workbook%203rd%20edition%20pdf'. While no scripts were explicitly extracted, the structure suggests a lure to external malicious sites, likely delivered via spearphishing.

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.com/wb?keyword=ready%20for%20first%20workbook%203rd%20edition%20pdf
    • http://files.c-nrl.com/uploads/1/3/1/6/131606260/lonevebof-budunun.pdf
    • http://files.portfolioinmotion.com/uploads/1/3/1/6/131637374/8d2f040022.pdf
    • http://files.saintjohnveinclinic.com/uploads/1/3/0/8/130814205/8074620.pdf
    • http://files.beabravo.shop/uploads/1/3/1/1/131163561/9035315.pdf
    • http://files.thecharestlab.org/uploads/1/3/1/4/131452991/xodopigif_wozutotiwes_muxosaxutagafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/sisupimitek.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/lepexibezosatebagiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0471/4404/files/votevamaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28851780814.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/laxuvunavixakaxa.pdf
    • https://telabawogevo.files.wordpress.com/2020/06/jijekorameviba.pdf
    • https://logedogobevo.files.wordpress.com/2020/07/gebagavibud.pdf
    • https://nonegek.files.wordpress.com/2020/07/befibiwizokorulib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22700630349.pdf
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/29386045896.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/ziriredaxudizir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/kewefatofobuvepalanumuku.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/dejekerifotuwome.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0960/files/musopokaforarakur.pdf
    • https://cdn.shopify.com/s/files/1/0428/7165/2508/files/49661234969.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2322/files/20375461758.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_off000063ef.bin
728e291d248cbe856bea546ce3b2197fb20edbc5ddb9e634ea2126cf3e6f9efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EF 5360 bytes
font_01_sfnt_off00007655.bin
88e730c2a83700b66524c1cf3a90ae21e4ce4e0dd7f7e5d3c54cf7613ee4e27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7655 11064 bytes

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