Malicious PDF — malware analysis report

Static analysis result for SHA-256 084bdd932bd497eb…

MALICIOUS

PDF

41.2 KB Created: 2020-07-30 18:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dc7a567ce03f1fb09bc6b927a2907a9 SHA-1: ecd49e154095cd99a5af1a7ef8f1869a1a603515 SHA-256: 084bdd932bd497ebeb9b8e240f4b54d86a97caf10a600ab838bfd0ccba34c084
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. This indicates an attempt to redirect users to malicious infrastructure, likely as part of an SEO poisoning campaign. The document body, though heavily obfuscated, contains keywords related to graphing equations, suggesting a lure to attract victims searching for educational content. No scripts were extracted, but the presence of embedded URLs and the malicious redirector link strongly suggest a phishing or redirection attack.

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=graphing+equations+in+slope+intercept+form+pdf
    • http://files.andriamesselt.com/uploads/1/3/0/8/130814235/4303661.pdf
    • http://files.mrkevinkimmel.com/uploads/1/3/1/8/131856851/somowugofev_bewanos.pdf
    • http://files.weddingdjcotswolds.com/uploads/1/3/0/8/130814043/likanazezuwixas.pdf
    • http://files.kalinabg.com/uploads/1/3/1/3/131398036/xirirerenemaram_kenomof_ledatinefov_lovamafenadobip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87745409623.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4474/files/watulasubo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3480/files/30494546319.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/49554427824.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/fimabapajejepafudejiliwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/70920001738.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/47715022327.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/55625545116.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/68383846000.pdf
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/37294686467.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/94029838624.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/rujelonowutad.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_off00006290.bin
c1751796e8ab4dfcd36e43ee90c7da00b3d77cd73ab2f02bc0dcf80137068692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6290 5608 bytes
font_01_sfnt_off00007572.bin
8888311f88b4deb47d38aad0da14af6c0e586e857b22bc3618ecb6d567de0909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7572 9848 bytes

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