Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45870c7f00e8f0f…

MALICIOUS

PDF

48.5 KB Created: 2020-07-16 14:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13607a3a727e10096654ae8087035cda SHA-1: c3d141ccaf7260683bf221110af11d766dfde5a8 SHA-256: d45870c7f00e8f0fb191887952047b87e339f4bb69be385d7de60381762499aa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to benign-looking WordPress PDFs, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, suggests an 'itinerary example' lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for linking to known malicious redirectors.

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/pify?keyword=itinerary+example+pdf
    • http://files.moonbouncerentals.net/uploads/1/3/1/6/131637562/tavunowi.pdf
    • http://files.kilmantinarts.com/uploads/1/3/1/6/131606690/fajixipivabi.pdf
    • http://files.westmaindevelopmentllc.com/uploads/1/3/1/3/131384255/13ac975e5d.pdf
    • http://files.gawlercalisthenicsclub.com/uploads/1/3/0/7/130775229/1872085.pdf
    • http://files.gaslogbbq.com/uploads/1/3/1/4/131437283/sabaguna.pdf
    • http://files.moonbouncerentals.net/uploads/1/3/1/6/13163
    • https://jigakufogil.files.wordpress.com/2020/07/mafivufowok.pdf
    • https://wawinosepof.files.wordpress.com/2020/07/dazuzibafunugitemixir.pdf
    • https://jevirik.files.wordpress.com/2020/07/nitigo.pdf
    • https://lexokafoje.files.wordpress.com/2020/06/52775607345.pdf
    • https://vusejiluvi.files.wordpress.com/2020/06/48651126573.pdf
    • https://razitarorabe.files.wordpress.com/2020/06/kizebukava.pdf
    • https://xawakoba.files.wordpress.com/2020/07/fixujorukako.pdf
    • https://rufumeridap.files.wordpress.com/2020/06/17925089144.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/79822116511.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/wuwigurikijivakuvir.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/71464662262.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/95285162573.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/koperawireriref.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/xokusavofavoxoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/66070814265.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/bejiwevepido.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_off00008154.bin
f893aba3df8c3dbff697c3070d9896b66ac447af455718ecd74673fba9a356b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8154 4796 bytes
font_01_sfnt_off0000917c.bin
9a0816d129740a39aed622f187a2c962f31c57c3b5380446c2d0dc45c03be967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917C 10196 bytes

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