Malicious PDF — malware analysis report

Static analysis result for SHA-256 5868d9818cfd55a2…

MALICIOUS

PDF

41.5 KB Created: 2020-08-06 10:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad9b8f96606271dd778c281e0c4f8ad SHA-1: 9f212eb39d60286ad5c024eee3226c42bc0d8b75 SHA-256: 5868d9818cfd55a208724f3adba0ec58d13449506603ca51ba4d9560b31ea4f9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though garbled, includes the same lure as the malicious URL, suggesting an attempt to trick the user into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.cc/pify?keyword=english+days+of+the+week+worksheet+pdf
    • http://files.jmhdesignandpainting.com/uploads/1/3/2/6/132681409/xarasivu_tuligesilop_zagarazesisej_wobatitesexogot.pdf
    • http://files.lambethlarder.org/uploads/1/3/1/4/131453592/gizatilawag_gogasotefotanut.pdf
    • http://files.nicoladaviscrafts.co.uk/uploads/1/3/2/8/132814220/werulo-sonad-tubefumu.pdf
    • http://files.seizediem.com/uploads/1/3/1/4/131438741/vewim_gifesimefipotu.pdf
    • http://files.lucentaesthetic.com/uploads/1/3/0/9/130969332/8591046aca08.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/alexis_ohanian_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/xavejotenevimivuritaja.pdf
    • https://cdn.shopify.com/s/files/1/0438/3070/6333/files/73636549538.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/dupijepofozedapukelatiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/60349510566.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/zaduxugabulodi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2115/files/13505084221.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/60959125515.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0629/files/jurgensen_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/scotts_speedy_green_3000_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/88193994795.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/48482074906.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_off00006365.bin
183e9350aff843f0e343b5873670b6429e704b0077a173abdbd7cdc04a3ff7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6365 5520 bytes
font_01_sfnt_off00007649.bin
0ba31ef52129a377155de4832eb2d9827ad12d1c4feaf1b074795bd466539ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7649 10204 bytes

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