Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacd6ecbc90d60ae…

MALICIOUS

PDF

52.3 KB Created: 2020-09-01 13:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cbd262f98ab26c720fb716a47edf8756 SHA-1: ec8c609554d678335bb376ee85be509e93b2cd25 SHA-256: dacd6ecbc90d60ae87898f94a661783b9d84513cb1555aa3a91b5b22d18790df
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and references 'asvab practice test pdf', indicating a lure. The PDF also contains a large number of external links, many of which are benign Shopify URLs, suggesting a link farm or SEO manipulation tactic to distribute the malicious link. No scripts were extracted, but the presence of a malicious redirector URL is a high-confidence indicator 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.cc/pify?keyword=asvab+practice+test+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/4769090923.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/47971801261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/litifefevadal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/wemezem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4600/1045/files/13097533766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6430/3522/files/vray_for_sketchup_2015_32_bit_crack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/padakoxevesipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/98457675850.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a298ce_0fef6fe9a6f548398e22eea2ea3e30b8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b11f6d_2f75e962f90440ddb054927c933aed8a.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7960 5304 bytes
SHA-256: 3932cd583ec9d8ea3b431996dd75c65416a88de69b3957d969b360bf09d67be2
font_01_sfnt_off00008b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7B 10652 bytes
SHA-256: 916763d87cb30dede8b7aee4ab4950b5d00f636994225a0f09a554efc005e03f
font_02_sfnt_off0000af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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