Malicious PDF — malware analysis report

Static analysis result for SHA-256 616f8ae2eecc7671…

MALICIOUS

PDF

44.2 KB Created: 2020-08-01 23:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c988d080d77ff3f77aece6b2d2ed6d31 SHA-1: 07f936717ab9027252d3a603a10de289093a17e7 SHA-256: 616f8ae2eecc76715e68a0e203dc9ec7f55b51ac6c10fd5f057d702e4b22bfc4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the visible text 'Mario flash games' and a URL that aligns with the heuristic findings. The presence of numerous external PDF links suggests a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious.

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=mario+flash+games
    • http://files.greatesthitswebsite.com/uploads/1/3/2/6/132681880/2076008.pdf
    • http://files.dylanthejeweler.com/uploads/1/3/0/8/130814714/4391086.pdf
    • http://files.mariannepoststudio.com/uploads/1/3/0/8/130813696/e2a5bb903.pdf
    • http://files.jennifergrayolson.com/uploads/1/3/2/8/132814593/61b592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/mijaxesegatibonoguxa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5033/4368/files/pijasefen.pdf
    • https://cdn.shopify.com/s/files/1/0430/9994/7169/files/paxewugunan.pdf
    • https://cdn.shopify.com/s/files/1/0433/5114/6650/files/vudugironiputotidefigagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/supezolugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/zugekizusata.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/78639978566.pdf
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/57005035999.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/99846414934.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/95539718019.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/yale_forklift_parts.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e9e.bin
2841ff9b7dad29406cf4e13ceea6d5362b893245595c278423688bb3983bbb6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9E 5188 bytes
font_01_sfnt_off00008027.bin
cf64dda47798c32e4e0a901dea4a433e57f114680ff207b0537db6c64a5622fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8027 10652 bytes