Malicious PDF — malware analysis report

Static analysis result for SHA-256 541356ec2a8065d6…

MALICIOUS

PDF

41.8 KB Created: 2020-08-07 12:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 155b7fc9e2e5bd8fbf14c8994e47ac98 SHA-1: d0b05001471745a1eaa810a856da68a2c135e53c SHA-256: 541356ec2a8065d63712f9840b745da58b51513118ade2f4de37b2d14f1a918e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with numerous embedded URLs, including a critical redirector link to ttraff.ru. This suggests the document is designed to lead users to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the presence of a malicious redirector URL is a high-confidence indicator of 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/wb?keyword=student%20planner%202018-19%20pdf
    • http://files.sierrastonefabrication.com/uploads/1/3/0/7/130775768/bapovonewimurumoru.pdf
    • http://files.markjmusic.com/uploads/1/3/2/8/132815298/xanigujuw-mekomas-turejubigeda-dezexewo.pdf
    • http://files.msm-missions.com/uploads/1/3/1/8/131856574/2278341.pdf
    • http://files.foresightencyclopedia.com/uploads/1/3/1/8/131871650/tejeziwemel-modabesuzoda-jinejogorasov-poxode.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/jeninisoxosako.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/25766748581.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9829/files/78799612508.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/map_clues_runescape.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/420_in_roman_numerals.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/17938179839.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/16671483196.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/cause_and_effect_essay_rubric.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/wudun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/89006156867.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/tijupufigonalel.pdf
    • https://cdn.shopify.com/s/files/1/0437/7467/3050/files/36094987568.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/fevapekeruxogaxadizafama.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ac.bin
194bdf3e57b4956bf9a8153e9a97c920d948df5d5fd30cb92676d84f780bb1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AC 5668 bytes
font_01_sfnt_off00007714.bin
1680921166ff1ec48ae2190d0a59a918a1a47da87750a0dc6306e3c6ade2f256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 10308 bytes

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