Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd36a988b4e31f1b…

MALICIOUS

PDF

46.5 KB Created: 2020-08-04 19:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 206b3d06bfa026491cfa0f79eca9fce2 SHA-1: 7c3bd7cd934a09fb163963d8e3da4520f0383008 SHA-256: dd36a988b4e31f1bb9e5aa2e194108825ce5a4a60829d6f18f57630c43c14459
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with a primary link pointing to a known malicious redirector. The document body text is crafted to appear as 'interview questions and answers for technical support pdf', suggesting a lure to trick users into clicking the malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates a potential SEO manipulation or content distribution scheme.

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=interview+questions+and+answers+for+technical+support+pdf
    • http://files.mrei.ca/uploads/1/3/0/7/130776183/gabefexuzusodim.pdf
    • http://files.sierrastrange.com/uploads/1/3/0/7/130739154/bofidixofolevez.pdf
    • http://files.porterranchchiropractic.net/uploads/1/3/2/8/132814898/sukukuwusoposet.pdf
    • http://files.welovedeutsch.com/uploads/1/3/0/8/130814513/vudepifabosijun-neper.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/rulibuwukibenil.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/74133443482.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/paxile.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/24420560960.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/college_algebra_6th_edition_blitzer_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8013/8398/files/gungeon_turtle_problem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/50648415202.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/xevosozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jedajuzosefowi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/darobikijoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ralaguguzovepusumizus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9089/files/sefegenaxudezat.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_off00007823.bin
2c75b63101591cc7cba4adc818fe92d6893b6e8d46b63607d5152160b70630e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7823 5460 bytes
font_01_sfnt_off00008ac3.bin
2188a4faafce6651f4c445983c1a997bce51b898adfc0684c9f46890536cf2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC3 9964 bytes

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