Malicious PDF — malware analysis report

Static analysis result for SHA-256 8854bd93430ead24…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 06:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb037977f18bc7a1a2bcfe6a38af799 SHA-1: 2cd6d2b182c132125a41c64ec373f6e98eeb05df SHA-256: 8854bd93430ead24ef218c9fae3f3a2d6c1c3c2394a8998a6333f3bd3075520f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'work study in apparel industry'. The presence of a link farm suggests an attempt to distribute malicious content or SEO spam. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=work+study+in+apparel+industry+pdf
    • http://files.australiancouncilofhinduclergy.com/uploads/1/3/1/6/131637529/mapowagemedolare.pdf
    • http://files.drmichaelgimbel.com/uploads/1/3/1/0/131069789/rovufu.pdf
    • http://files.uscgminf.com/uploads/1/3/0/7/130738919/vezobefudiw.pdf
    • http://files.solotetea.com/uploads/1/3/2/6/132680874/8560179.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/52557793449.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/xuderofagut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0667/2546/files/68079929217.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/46011827972.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/autonomous_maintenance_for_operators.pdf
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/what_is_a._js_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/bivovovuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/95608157703.pdf
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/coreldraw_x8_shortcut_keys_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/90775610343.pdf
    • https://cdn.shopify.com/s/files/1/0435/5375/1189/files/leisure_suit_larry_reloaded_walkthrough.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_off000065fa.bin
6da3e7c25a66972b1082d7151574845d262842084fd0a77a183f479e23e38a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FA 5212 bytes
font_01_sfnt_off000077de.bin
b17d43057d4c9ac09248c4fd65770de57b320d8eb5da3d2120dee2f650c807b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DE 10348 bytes

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