Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90785ef160cc1ad…

MALICIOUS

PDF

64.5 KB Created: 2020-08-01 17:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cee7cffb95f28ebd08d03e358c9eb51 SHA-1: 80ba359f92212d1e2253c5ca027c63fb7242201e SHA-256: a90785ef160cc1ad68367e259cb93aefc0c39213a8b62d2e24255c28738dec68
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=rotate+a+matrix+by+90+degrees'. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness. The presence of many links to external PDFs, some hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=rotate+a+matrix+by+90+degrees
    • http://files.mandyhodgewellness.com/uploads/1/3/1/6/131607522/dazozelozupej.pdf
    • http://files.womansclubofpowhatan.org/uploads/1/3/1/8/131856146/3273816.pdf
    • http://files.sonjanagy.com/uploads/1/3/1/1/131164129/4082342.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/51026256730.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6090/files/62370544044.pdf
    • https://cdn.shopify.com/s/files/1/0433/8221/0725/files/99582223122.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/52496347387.pdf
    • https://cdn.shopify.com/s/files/1/0436/0952/2339/files/zolutixijeviwolapoxusuzod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/livasizegusotazufegaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/lorenamowovefapolamafunok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/51735180622.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/kezatowemabiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/wovemegete.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/72659037604.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/43632611720.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/tujuwajexipefuzapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/91573554952.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofekofunore.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_off0000ad40.bin
9ddc4952de332d1c1c41207f4d0c9a9dd056ca4c14a169ebe67b455ccfc66f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD40 5728 bytes
font_01_sfnt_off0000c0b3.bin
c156ae63416639219c42d53c7d0b5fb4df6c360f808b77c39524e941315477b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B3 16616 bytes

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