Malicious PDF — malware analysis report

Static analysis result for SHA-256 b682211c3701cd65…

MALICIOUS

PDF

44.8 KB Created: 2020-07-30 08:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ebcc2432caf69c59426154e13ce58f3 SHA-1: dbad8063958f31baa63722fa68448831567f500d SHA-256: b682211c3701cd657eba6f6b3aa8c53505604555303214a1507b532343aa785b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=autolesion+no+suicida+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'autolesion no suicida pdf' and 'wkhtmltopdf', suggesting a lure document.

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=autolesion+no+suicida+pdf
    • http://files.dancedriven.net/uploads/1/3/0/9/130969573/110926.pdf
    • http://files.blissfulcounselling.com/uploads/1/3/1/4/131455621/bf8d17f70abf85.pdf
    • http://files.aqua-ohm.com/uploads/1/3/1/3/131380354/peligog.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/32288504044.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/10477556138.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/zozusu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/26495532455.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/xisosevasurakokezula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/72073820803.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/gekafojabomijejufas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7843/files/veridegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/somariwunutovaponafuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/fosefisafup.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2320/files/xinujisotosilowozokidako.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000723f.bin
4bc67bcfb1b0bd1de3603b5900b30ba2c398d71ee206f721f501419354d865d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 4924 bytes
font_01_sfnt_off00008313.bin
ceef788222e0b0bcec43d72385c46cce553a4a6ac07edb87c94417892c9a83b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 10412 bytes