Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71bc164095c7a83…

MALICIOUS

PDF

44.7 KB Created: 2020-09-09 11:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae73b7551a416b85271da86c33548c6 SHA-1: 1e34319d98c4feea1e8799b28a0595a6e76e2c58 SHA-256: e71bc164095c7a83f003fd3f8d7b0a896256680b2dafbd35f65bfa69471589d7
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic. The presence of numerous links, including one pointing to a known malicious redirector, suggests an attempt to direct users to malicious content or for SEO manipulation. The ML classifier also strongly indicated maliciousness.

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=7+segmentos+catodo+comun+datasheet
    • https://static.usrfiles.com/ugd/f55bec_df1b405577fa41c481d19efe1c189cd0.pdf
    • https://static.usrfiles.com/ugd/6d45f6_d17a6d67c126441b82caf9d614127fe2.pdf
    • https://static.usrfiles.com/ugd/bc0d1e_5b503ddef86a44e094e276628c708343.pdf
    • https://static.usrfiles.com/ugd/7008f3_a2cea7b8b0ba4e1ca15f3597f66864ba.pdf
    • https://static.usrfiles.com/ugd/5ad03d_67ea5358c19d4890bf6050668274c4e5.pdf
    • https://cdn.shopify.com/s/files/1/0428/8171/2287/files/suits_episode_guide_season_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3816/files/93986409965.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/98842515307.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/damuburasuwusosafudopuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5304/7195/files/dinedupofajifepirivax.pdf
    • https://static.usrfiles.com/ugd/49488e_494a7c2832644a0093ad8e00436368cd.pdf
    • https://static.usrfiles.com/ugd/95bb70_51cac3e413e5480089535a0e0fb56326.pdf
    • https://static.usrfiles.com/ugd/5b9365_a158475ebbb54d67b2b170a85a704dc3.pdf
    • https://static.usrfiles.com/ugd/c618e9_05239499aee1433f80a8eb917384528a.pdf
    • https://cdn.shopify.com/s/files/1/0445/8476/3556/files/apset_computer_science_previous_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/95408138775.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/martingale_betting_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631d.bin
ef9b6f5fb12a7d7edeb18e2a5195b96c52c81813348de3122b74f927b6bf2897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631D 5044 bytes
font_01_sfnt_off00007411.bin
ea8a480361573508bc9cb4765265933e382290cde7bdaa4407ff9943a97c3e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7411 10376 bytes
font_02_sfnt_off0000979a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979A 4324 bytes

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