Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c3480e47338c31…

MALICIOUS

PDF

45.1 KB Created: 2020-09-17 09:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a8ee13b7a26624b909724d15655f3e5 SHA-1: 5bf969dee53a63e38af6c2f658d498931acb08a5 SHA-256: f7c3480e47338c310539ce9ce47f4f983f89bebc2eaeb0ff1835dbb553344364
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, https://ttraff.club/wix?keyword=affidavit+of+marriage+for+immigration+sample+pdf, which is designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, appears to contain the same lure text and numerous links to other PDF files, suggesting a link farm or redirection strategy. 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.club/wix?keyword=affidavit+of+marriage+for+immigration+sample+pdf
    • https://98584cd9-dd9b-4a88-98fd-7df8fac7c2f3.filesusr.com/ugd/09c3c7_97ae049b84af4760a95c238f9fecc18d.pdf?index=true
    • https://f3d768c0-1cc9-4114-86be-39e3adecfe92.filesusr.com/ugd/80685d_0ef8720212404b62b6be08b3e5101a07.pdf?index=true
    • https://d34d76e4-5e11-4d2e-ad0f-0c297f054374.filesusr.com/ugd/f1780b_d75f6380887946f38f454116f6de2cdb.pdf?index=true
    • https://ebdba004-485a-4991-940e-28a587d4b264.filesusr.com/ugd/110ef3_652ff2d997a04f4f93e959b880e9b11d.pdf?index=true
    • https://c0268f93-3a8e-4ffb-a1ad-5c5aae127512.filesusr.com/ugd/03ef8e_cc5713313c2742ad873201f4872800ea.pdf?index=true
    • https://1f293bd3-c458-462d-9182-840fa68a6e2f.filesusr.com/ugd/808cd0_48b3f2676e654ffa848809b71b991015.pdf?index=true
    • https://7bd08535-578a-4db7-b7d2-56d6701a197e.filesusr.com/ugd/0cd3a8_e7d3a3e5be3b475b8af9c0d6877a284b.pdf?index=true
    • https://3eff455a-2c6b-4a78-8554-3a92923474cd.filesusr.com/ugd/76156b_700cbbb5e1b34817ab7277fa75d45d35.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/0684/3288/files/74803093022.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/ssc_mcq_answer_sheet.pdf
    • https://f1c92663-e818-4356-91e9-b3c8129ca2d2.filesusr.com/ugd/140efa_b5fa0a71eb48475f8d20e7503b381661.pdf?index=true
    • https://f3f9fd64-8ad7-4774-809d-d12e98d7d335.filesusr.com/ugd/696117_74052fed622543619f0d2a3c0a0c0ca4.pdf?index=true
    • https://28642395-a7e3-4482-9124-055279ce2cb5.filesusr.com/ugd/90c678_39fab1b87aa04acb984056a2d9d09fb0.pdf?index=true
    • https://f89619a2-d90e-4ae1-9f03-560664f1f4ba.filesusr.com/ugd/7a359d_2ffc2886404d43c8889c62791a893ecb.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_off000063cb.bin
ad944a277ddc1c1679d70aeeb0b5160c7d394c948f23507bf65bb963d0149719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CB 5200 bytes
font_01_sfnt_off00007560.bin
6fa0fbb9cedcc10188017abff48d2a12467ad15c0667eb2471cd592b3bdfb089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7560 10440 bytes
font_02_sfnt_off00009901.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9901 4324 bytes

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