Malicious PDF — malware analysis report

Static analysis result for SHA-256 890ed5d4cdd2dadb…

MALICIOUS

PDF

35.1 KB Created: 2020-07-31 17:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55cf92c771969453968959fbf652e13 SHA-1: fc5386cfdd2d7603b869b3b4662b664d9c934ae6 SHA-256: 890ed5d4cdd2dadb60dd0e82de606864db7feff815aa853948c3350c0e9f8bfd
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'Whirlpool duet steam dryer' and a URL pointing to a redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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/pify?keyword=whirlpool+duet+steam+dryer
    • http://files.woodenbowtieentertainment.com/uploads/1/3/0/8/130813777/xajaleki-xodude-mojezuwufuw.pdf
    • http://files.townofgreenport.com/uploads/1/3/1/6/131637108/6cbbe1.pdf
    • http://files.kealohavolleyball.com/uploads/1/3/1/3/131383838/b281ae2e3d5.pdf
    • http://files.gladewaterathleticbearbooster.club/uploads/1/3/1/4/131453121/9425687.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/tufafizizafizujivebaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faxusumowavunisipor.pdf
    • https://cdn.shopify.com/s/files/1/0429/2159/0951/files/79840233496.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/9162172878.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/92809248444.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/98325981697.pdf
    • https://cdn.shopify.com/s/files/1/0438/2418/5506/files/vujesumux.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/93453230754.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0315/files/75118377566.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/jodomaxowevifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0103/files/lewupatijen.pdf
    • https://cdn.shopify.com/s/files/1/0437/5229/2513/files/17990127229.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/vobofomesonikamufakug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/72355191894.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_off00004c4d.bin
9c734451ec4293341c59e35d6c32511e17afe4a8c06dfaed3c7ba47d5f774322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4D 5312 bytes
font_01_sfnt_off00005e3c.bin
d604c1c8b2f0ac193a9f7fc739193c23296e2235165e7797844210bc8dd895a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3C 9464 bytes

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