Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4df5d17a24c0935…

MALICIOUS

PDF

37.8 KB Created: 2020-09-19 12:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0ebcb2bf852e4401c6117053ce7d6d SHA-1: a2d5e8bfd15bdd9b6d1c36722516b58da8ade239 SHA-256: c4df5d17a24c0935afbf6ddc912b3d1f1546da64557b4665bd48c057bef7cbd2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Andean chevrolet jobs' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation to improve the ranking of the malicious content.

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.club/wix?keyword=andean+chevrolet+jobs
    • https://f4e69a36-3f68-48d1-9dfc-113a5656e72b.filesusr.com/ugd/a382ee_28e959ae4b2743728fd80a80cbcdfa76.pdf?index=true
    • https://c9ebc49b-20ce-488d-9a2d-9fe8f2b364b3.filesusr.com/ugd/8a4248_44980bd1b7e14f259a0fce44993deca0.pdf?index=true
    • https://938c9b7e-dd25-4fdb-bfad-85437b9d20c4.filesusr.com/ugd/e3325f_47c1980093974424b7a4a971a4fe4143.pdf?index=true
    • https://64537a4c-2c7c-4546-b4a0-0f71fe94e813.filesusr.com/ugd/f2ef67_c32a9f302db7434399f8e5eb9b3e6990.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/kalilutizop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/transformations_of_sine_and_cosine_functions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1594/5890/files/trigonometry_calculator_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0468/8897/6541/files/xaxat.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/mario_kart_64_gameshark_codes.pdf
    • https://cdn.shopify.com/s/files/1/0440/7256/6936/files/patton_high_school_staff.pdf
    • https://cdn.shopify.com/s/files/1/0438/2497/1936/files/financial_business_analyst_interview_questions_and_answers.pdf
    • https://ec292b65-5185-4611-814d-8e0dc556e250.filesusr.com/ugd/35f767_70fff4f8676f451d905eab54ac4a0c1c.pdf?index=true
    • https://9851d813-15f9-4f19-8b8a-34d95487a4dc.filesusr.com/ugd/4a2613_a7f4ed7f634f4b36a17617a8a2f54fd7.pdf?index=true
    • https://8fbe0aff-1341-4ac8-b3fc-f8649fd9d5ac.filesusr.com/ugd/f34323_c8d465da12d04af593acc2f6d76e3985.pdf?index=true
    • https://7e0494c3-52be-489e-b96b-89a5bd85a255.filesusr.com/ugd/17159d_1f3f70ca58ae4c9785d9f661070aa91a.pdf?index=true
    • 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_off000054cc.bin
d09de1850a4d0fdb4c3405b068c9b416cd7a28abec3e70178d739304ba8550c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CC 5292 bytes
font_01_sfnt_off000066ca.bin
a8e2187c7a8200959e96ef5eb3620afb68e9c5bf07de70fff062cb71394a4301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CA 10536 bytes

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