Malicious PDF — malware analysis report

Static analysis result for SHA-256 673450ec958e9da5…

MALICIOUS

PDF

42.9 KB Created: 2020-08-12 09:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b844ce2cbc54acf3b3865c5853b71ff0 SHA-1: fc9409ab7520ade63b0d88d8180a6f52ab6bc25c SHA-256: 673450ec958e9da5153925e68f8c93f2dddd849628649106a63081d8c6e861bc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, suggests a lure related to educational material ('area of a parallelogram worksheet'). The presence of multiple PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=area%20of%20a%20parallelogram%20without%20height%20worksheet
    • http://wumekatu.pigmentsauvage.com/uploads/1/3/1/3/131382406/zaloxaz.pdf
    • http://files.spumcny.org/uploads/1/3/1/4/131453917/767573.pdf
    • http://files.alloneocean.org/uploads/1/3/0/7/130775291/wumutiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8721/7319/files/installation_de_canalisations_lectriques_ofppt.pdf
    • https://cdn.shopify.com/s/files/1/0430/0544/4259/files/gasification_of_coal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/40962750353.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/spanish_travel_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/adjective_order_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/branding_vs_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7736/files/types_of_hydraulic_actuators.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0381/files/kimidegajenizivutogigezug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/38961043395.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/94717732943.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/gaxugunovaponog.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/93235148795.pdf
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/networking_courses.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_off00005b9c.bin
eec6f1f5b3b7775ba12feebb2e46a1c8dffccfb814a5c3d34c8dd839b58aa060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9C 5236 bytes
font_01_sfnt_off00006d82.bin
c95d2be2f373667250bbdc9e26e8c39c197e2f0ffc10779c5b3b5c3737577782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D82 10140 bytes
font_02_sfnt_off00009028.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9028 4324 bytes

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