Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d422870fea1596b…

MALICIOUS

PDF

50.3 KB Created: 2020-07-09 04:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b23d80c9b62d1cd218fdf3f37ebf56 SHA-1: c2a24379b0102cfbe657eed6e1f063a9c83e6eed SHA-256: 1d422870fea1596bd82d3b3691dd6fbd8b0d91e12f5281aba3a3a6cfed75b807
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body and embedded links suggest a link farm or SEO poisoning tactic to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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=bloody%20bones%20pdf
    • http://files.madlyeclectic.com/uploads/1/3/1/4/131483253/nuwitoduku_xafozovininu_lekilirox_navagad.pdf
    • http://files.sidleystandup.com/uploads/1/3/0/7/130775942/3089407.pdf
    • http://files.sittingsisters.com/uploads/1/3/1/3/131384771/senobuvugujapulebume.pdf
    • http://files.computerscpr.com/uploads/1/3/2/7/132740860/xubujolodosetejokuv.pdf
    • http://files.fitzpatrickecologicalconsulting.com/uploads/1/3/1/6/131607269/dadivufesale.pdf
    • http://files.portville-presbyterian.org/uploads/1/3/1/3/131398367/lebebi.pdf
    • http://files.dianehaymesphotography.com/uploads/1/3/1/8/131858287/94fcd.pdf
    • http://files.autumnskinner.com/uploads/1/3/1/3/131380032/4414022.pdf
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdf
    • http://files.theroute92.com/uploads/1/3/0/8/130873973/zuguxizamuri.pdf
    • http://files.hartosteopathy.com/uploads/1/3/2/8/132814969/bimas.pdf
    • https://metefodowu.files.wordpress.com/2020/06/tewazisuwumofute.pdf
    • https://kuborenop.files.wordpress.com/2020/07/98135656120.pdf
    • https://vosariboju268504950.files.wordpress.com/2020/06/bowupa.pdf
    • https://pigejonuzona.files.wordpress.com/2020/07/wikuzazugufibaxejatot.pdf
    • https://wogikasu.files.wordpress.com/2020/06/zizov.pdf
    • https://bawegepagema.files.wordpress.com/2020/06/zezesojuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087f5.bin
a9dac7ca60ee52dfb2b735ba7da8e76349e4f8a0d7a69b982b1321a1b587aec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F5 4680 bytes
font_01_sfnt_off000097ea.bin
944dee1c9e42f83b87c6db9447d31932326fbfbad37097674e0e65550bace179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97EA 10656 bytes

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