Malicious PDF — malware analysis report

Static analysis result for SHA-256 371968380137fa27…

MALICIOUS

PDF

43.4 KB Created: 2020-08-10 03:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e3b94b9e9fb6798bfd7cc28e3f2d7d SHA-1: ed05ce4f56e1c4727b28c1e6a048656bad7f7c60 SHA-256: 371968380137fa273e6721763c941c2bd65a8478890754e8fa1293fde4b0eada
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. This suggests the primary purpose is to redirect the user to a malicious site, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+pdf+resumo
    • http://files.prattindustriesboxesericstorm.com/uploads/1/3/0/7/130740142/47de1270a1ad0.pdf
    • http://files.jragourdart.com/uploads/1/3/1/4/131406749/3114f1dc136d.pdf
    • http://files.leatherwise.co.nz/uploads/1/3/1/4/131413718/9fe8105.pdf
    • http://files.19thholetravel.com/uploads/1/3/1/1/131164488/1683731.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/98096400345.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/ohio_living_will.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/galekezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8744/files/7301041983.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/modern_compressible_flow_anderson_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/35771528045.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/namujoloxifigitodet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/89100050455.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/87441548848.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/zutemorewizulalofito.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/low_frequency_response_of_bjt_amplifier.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065bf.bin
6f51f13f2225f6ae824c74b33bb9d6eb343c0e997f9ce7f70be1bcb374286315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BF 6044 bytes
font_01_sfnt_off00007920.bin
75d027f7d055dcb60fed1097b6e72a2a2f4266772aacfdde0d7f6bbbff05b0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7920 12348 bytes

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