Malicious PDF — malware analysis report

Static analysis result for SHA-256 992a061442102596…

MALICIOUS

PDF

38.2 KB Created: 2020-08-01 14:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fcef51dcf4ceabdc174e752431bf748 SHA-1: 26ab0aa402e49c2592843da36cc51bc1376e794e SHA-256: 992a061442102596ff4926c633c6c7f9e65512cdaea47839a2af7012d41e0691
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily corrupted, contains text suggesting a lure for educational materials, aligning with the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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=saxon+math+5+4+solutions+manual+pdf
    • http://files.colganscattle.com/uploads/1/3/0/7/130776150/774e679561fd27.pdf
    • http://files.lionpridebands.com/uploads/1/3/2/6/132682051/5ea245fd24e.pdf
    • http://files.socialdevelopmentlab.com/uploads/1/3/0/9/130969298/9198417.pdf
    • http://files.frenchstandardpoodles.com/uploads/1/3/1/8/131857465/daloxobeboke-xekokelugugewer-fexibob-gulafop.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/bipupojuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/98075763965.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/73690879215.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/funavejapubawesiduki.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/john_deere_lawn_tractor_parts.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/54773257483.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/visifivilonusij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9242/files/63925406111.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufotiniponekurek.pdf
    • https://cdn.shopify.com/s/files/1/0434/6531/0373/files/27158750078.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0665/files/71246850628.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7069/files/jivibenapew.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/47289488006.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_off000054c9.bin
699b8b3c9819278a69292ba36b68650ab15ccc60999c921537daf312a2e6d499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C9 5568 bytes
font_01_sfnt_off000067a3.bin
9cb189951e40973608b27ca2630529d710f9b47821d1957ee53b0cc05453fd0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A3 10684 bytes

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