Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b8a7756873495e…

MALICIOUS

PDF

41.8 KB Created: 2020-08-02 05:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8dfdf5f2be09bcbde29447f7d6186e2 SHA-1: f90bbecfd17352ffa4fa2b0c546fb84e91cf0007 SHA-256: 78b8a7756873495e5b9dd669b9a0d80867d842cefdad23d5d7960c00b2c2ee0e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, specifically advertising a cracked software product. The heuristic firings indicate the PDF is designed as a link farm, with many external links, one of which is a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=tone2+rayblaster+vst+crack
    • http://files.northwoodhk.com/uploads/1/3/1/8/131871698/jesusazem-valiropoxi-somofetuxapega-migoniwo.pdf
    • http://files.gyrobot.co.uk/uploads/1/3/2/6/132681910/nowosa.pdf
    • http://files.yourpanamatours.com/uploads/1/3/1/4/131412032/6386831c5f8492.pdf
    • http://files.carolynfordart.com/uploads/1/3/0/7/130740011/mevowowedek_duwuwaviveto.pdf
    • http://files.jottnew.com/uploads/1/3/0/8/130874691/c4845f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6119/9526/files/10758097216.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/sonifopipa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/gekoneluw.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/3157727165.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/47536823472.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/fagetibadivejovifit.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/jomewuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/91282776378.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/19774288211.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/9071557528.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/duxuwanemeka.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_off0000659a.bin
4ca8f1e0a61b3ee41e1216148d3c120b41a1103f472254595671b17b633f49bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x659A 5240 bytes
font_01_sfnt_off0000778b.bin
4dc3672fff86bc36d15c2944454c8504dddda34eebb9af54a5013649acfcd860
pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 10252 bytes