Malicious PDF — malware analysis report

Static analysis result for SHA-256 1555ad2df8eff228…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 00:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d34a5ce6d98aa3810ed6b60dcb98c20e SHA-1: 2a0931ef029ffc25950d56983f5ea32baaa70b3b SHA-256: 1555ad2df8eff228bbf61c45823266fe8ac1abde65cc063d41cfc82c7703bbd6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector infrastructure, which is a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.cc/pify?keyword=acls+bls+pdf+2020
    • http://lanulaja.cpi-plasma.com/uploads/1/3/1/8/131856584/8642426.pdf
    • http://files.diningsolutionswickerpark.com/uploads/1/3/2/6/132681928/9437442.pdf
    • http://files.bradleyfoisset.com/uploads/1/3/0/8/130873855/7852968.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/5983637660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71419102660.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/dokulakadamunozuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/72370296535.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/loxof.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/20701350392.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/45077644119.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/vilumutuziwebefug.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/87954054993.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8768/4003/files/98851406735.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006392.bin
0f0fa5e15cfa9b58659fb0c120471f02af59aa6a04afd957da216f8d7ae7245f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 4572 bytes
font_01_sfnt_off00007315.bin
d2da649d5c7425fe4d01ad4ffb1811628df680339aa38e3c2d8d01ad8a5981f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7315 10036 bytes
font_02_sfnt_off00009559.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 4324 bytes

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