Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67096e9b2dfe30…

MALICIOUS

PDF

51.5 KB Created: 2020-08-05 15:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c6959703ab747c85ee62fa9b083303a SHA-1: f197d9ba19f8c313c30df5794dddc782b4e22a5c SHA-256: 6f67096e9b2dfe30012c26eda6b465a996797c1190a8474d61d4b6cde946c9d3
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 Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text "English puzzles and riddles with answers pdf" and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of embedded links and the ML classifier's high confidence score indicate 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/wb?keyword=english%20puzzles%20and%20riddles%20with%20answers%20pdf
    • http://files.strathmorechildrenschoir.com/uploads/1/3/0/7/130739222/8739174.pdf
    • http://files.sharitavonsikphotography.com/uploads/1/3/0/7/130739470/892586.pdf
    • http://files.nhlogcabinrental.com/uploads/1/3/2/8/132815318/751000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/828580197.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/firomezajanijir.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/axis_bank_credit_card_closure_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/rigudojutitulut.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/nefinalatapusig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/unity_camera_movement.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/cartesian_dualism_mind_body.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4981/files/dufiribipilafuvunaxegakam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3517/8661/files/300_core_java_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/12352650757.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/65662341289.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/32153870334.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec1.bin
a217f547089b6ed1de94394e9297ec065494bbcf865458a26f084d9eb4c8cefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC1 5400 bytes
font_01_sfnt_off00009133.bin
e2471563708f8728ce2eaf177b5360effcf222f88fef6f1e84702366dd34a49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9133 2464 bytes
font_02_sfnt_off00009c0d.bin
084baed2c08ba575d33f2552c5a9aa5ddccc03a33283e74c0ad2bb62444a3b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0D 10704 bytes

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