Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edcf4433002fd38…

MALICIOUS

PDF

42.2 KB Created: 2020-08-21 17:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a70b3cd3c34ec51c7391484de747d721 SHA-1: 6e46884e2660751da37e3e7fe27829b31e4f7105 SHA-256: 0edcf4433002fd387b754d73fb67e88ea0ad04b48302061c16a54dab157ff44f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `ttraff.com`. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDFs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking the malicious link, 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.com/pify?keyword=psicologia+aplicada+a+administra%25C3%25A7%25C3%25A3o+de+empresas+pdf
    • http://files.robinsonmsband.com/uploads/1/3/0/7/130776490/kefojidore.pdf
    • http://files.kinderdagverblijfzandopdemat.nl/uploads/1/3/1/4/131452838/waziva.pdf
    • http://tijewuta.propello-coaching.com/uploads/1/3/1/3/131383791/2e07c60f97bb3b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/akhiyon_se_goli_maare_remix.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0575/files/singapore_hotel_financial_report.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/topamomobujapop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/69921409318.pdf
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/angry_anime_girl_gif.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/64740111836.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8695/files/gedobugexusado.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/66168864824.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/dirupofan.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_off00006094.bin
9471c09f2a0a021e6471fa0a9dc1e84d3c2495730bce480771a2080552a9db9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6094 5976 bytes
font_01_sfnt_off000073f5.bin
ba8ad646d122b136dabf98c87382491a01796b4b93c90a2ac080e59037dc8457
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F5 12932 bytes