Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b501c5b5f1056ac…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 01:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d34f233df0ffcaaf59bb75154252cd71 SHA-1: 86aee1b275df53fc61f92b980da1f2d9ad645d7b SHA-256: 9b501c5b5f1056acdae9edb257dc14364f9040fc34be10b3155a59712718d516
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though corrupted, suggests a lure related to an 'internal audit report'. The presence of multiple Shopify URLs, alongside other domains, indicates a link farm designed to obscure the ultimate malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=internal+audit+report+pdf
    • http://gogevo.pinehawk-knives.com/uploads/1/3/1/0/131070420/686c2b663c7.pdf
    • http://files.jadecaryromance.com/uploads/1/3/1/4/131406800/739c6f9f87e.pdf
    • http://pebero.mariposasummerfunstreetfair.com/uploads/1/3/2/8/132814930/e2cd481eba78.pdf
    • http://files.tucson3gun.com/uploads/1/3/2/6/132695915/f25373b.pdf
    • http://files.authorlucymcconnell.com/uploads/1/3/1/4/131407625/a7e3290f.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/54346307279.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/jeniponixe.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/venn_diagram_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/69217591503.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/4658517205.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/luzutinamoniroxapa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/yesterday_once_more_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/23952191039.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/valvoline_5w30_synpower.pdf
    • https://cdn.shopify.com/s/files/1/0440/5988/5733/files/commutative_associative_and_distributive_laws.pdf
    • https://cdn.shopify.com/s/files/1/0437/3010/8577/files/29372326299.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/micah_stampley_our_god.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/67561232196.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006384.bin
14ff740b515a53093d5ab4ee63c5da9eb3506a37b141b62e092a610ef09ce997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 4796 bytes
font_01_sfnt_off000073e4.bin
df5d74242db549387ccc095c4908c1444694c1ff93abaabc411b11a71797a964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E4 10640 bytes

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