Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bad4e4c8d901f22…

MALICIOUS

PDF

49.7 KB Created: 2020-09-19 11:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c218e6787aeda8dd7137cc4b8b22681 SHA-1: 67ba641453bc97b551c420572e4a204fcb18eda0 SHA-256: 1bad4e4c8d901f2206b8f4c19e2991d98f1904f7c8fb7c786d7ffc7d175b2dbb
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. This redirector is designed to lead users to a URL containing a specific keyword, suggesting a targeted phishing attempt. The presence of numerous other PDF links, many pointing to external sites, indicates a potential link farm or SEO poisoning tactic to distribute 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=crest+high+school+ffa
    • http://files.happykidscambodia.org/uploads/1/3/1/6/131637136/5822066.pdf
    • http://files.eloyjrojas.com/uploads/1/3/0/8/130874012/rowudezaliboti.pdf
    • http://vogewako.adventuresinfullness.com/uploads/1/3/1/4/131454526/62ecd4375f9ed.pdf
    • https://cdn.shopify.com/s/files/1/0434/5026/9849/files/54233723107.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/sededevelatik.pdf
    • https://76ed91da-bf49-4857-8fb2-81681ff65da8.filesusr.com/ugd/8e66a5_47e6eb5117d64c3a8bdcff3e2c4c1e0d.pdf?index=true
    • https://25d6b42b-a70c-4f14-ba71-2cd1e771c81d.filesusr.com/ugd/b148e5_a62a824b05ce4d9982e1ab780887761a.pdf?index=true
    • https://cf397cbf-d9b6-44a0-8320-02f220cb552f.filesusr.com/ugd/0d9a50_67ca7fad82b44fd59786551b2aa2ac09.pdf?index=true
    • https://395d09a7-40d9-4dd5-87a2-32ad1aa33c88.filesusr.com/ugd/3a38e0_b79db0fa95fd4c94be24b728a188404e.pdf?index=true
    • https://d916ad11-8667-448c-8c91-25854b628a2b.filesusr.com/ugd/359e64_72cc258bdc544f51bf1ad60515e56c36.pdf?index=true
    • https://0b0010a5-8d48-4a45-ab56-e94713fd8458.filesusr.com/ugd/c0fca2_6a450d5450f947829c7cc7983e49fba6.pdf?index=true
    • https://644741c7-10c1-4c23-be3f-84ce93b5938b.filesusr.com/ugd/227d0f_d04c91705cf94f2993f3080df87512a0.pdf?index=true
    • https://c8c9885e-49a5-473e-901c-5ec8fce9c81a.filesusr.com/ugd/7a11b0_a590c7b4589d4c08abaf9739eae73502.pdf?index=true
    • https://e9c33860-8119-4361-ba73-eff01dfb6380.filesusr.com/ugd/6924eb_42e4b7444ded465c8e578bf984f34307.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077b9.bin
8c34baefb8f5968b57ec32eddf0e88018f36e682194cf75d62a68783fbcdcdef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B9 4848 bytes
font_01_sfnt_off0000884d.bin
857f1fcacd5c41d288f610aaaf32c990b8d0bacff224a956f159ed007f988b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884D 10504 bytes
font_02_sfnt_off0000ac20.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC20 4324 bytes

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