Malicious PDF — malware analysis report

Static analysis result for SHA-256 704942c366a42883…

MALICIOUS

PDF

41.8 KB Created: 2020-08-08 01:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a79dd0f4e0a07fcab2ba0b1f6ff393ec SHA-1: 249afd31d5a82ba95ca37e1373a5adb55f62f032 SHA-256: 704942c366a42883cf74de53d6ff37a974ec2d51de785e663c9991eb67a2526d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though obfuscated, suggests a lure related to 'food chains' and the authoring application indicates it was generated by wkhtmltopdf, often used for SEO spam. The presence of numerous links and a malicious redirector indicates an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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=que+es+una+cadena+alimentaria+pdf
    • http://files.stumparmour.com/uploads/1/3/2/6/132682039/765007d3dc.pdf
    • http://tesugur.forstalsiberians.org/uploads/1/3/1/3/131398367/96b4bfe746f120.pdf
    • http://files.pjsnacks.com/uploads/1/3/2/6/132695874/nopuzawukotak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/5229369497.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/vogeruxizigabosivadob.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/davar.pdf
    • https://cdn.shopify.com/s/files/1/0437/3830/0568/files/78371601410.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/15619126649.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/niwifomododonoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3067/files/sovebuloluwusetatupalobuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1223/files/warulunirurapesubimakoxiw.pdf
    • https://cdn.shopify.com/s/files/1/0446/1517/2259/files/devi_purana_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/kubota_l3130_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/93755686568.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/35404234889.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/86086660007.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_off0000635f.bin
a63d048a9eae253dda368780b2cee78945b43730180d8d967d29b5f961e022cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635F 5360 bytes
font_01_sfnt_off00007582.bin
22017b1608286cd10967d3897d90ef3a649f666dc1a6ba2837a7c3349c94ce48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7582 10728 bytes

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