Malicious PDF — malware analysis report

Static analysis result for SHA-256 797d9c8eeb030866…

MALICIOUS

PDF

41.0 KB Created: 2020-08-04 23:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51d8d3e89db6f0db17debd30bf2e8a88 SHA-1: a1f04f38c4585070572490f92f0482f1e4e1348f SHA-256: 797d9c8eeb0308665815927edc2270ca5c2bdb45ad34432fa923c7561814e3f6
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector infrastructure known for malicious activity. The document body, though obfuscated, contains text related to file conversion and a URL that appears to be a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or redirection tactic to obscure the ultimate destination.

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=arabic+text+pdf+to+word+converter
    • http://files.ffwbcbooneville.org/uploads/1/3/0/9/130969499/xilanoxiz-duwimiwopi-lerutasemuwopu.pdf
    • http://files.brookewood.org/uploads/1/3/1/3/131383738/povovobovirones.pdf
    • http://files.wildonionfarms.com/uploads/1/3/2/6/132681916/ff06d241bf115.pdf
    • http://files.lostinjewellerymagazine.com/uploads/1/3/1/1/131164479/4709941.pdf
    • http://wateseg.booksaboutrealwomen.com/uploads/1/3/0/7/130738732/9748603.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/32779651227.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/brian_wilson_beach_boys_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/37291683158.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/lymphatic_system_histology.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipipopiluniwewikojidil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/23520478790.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6437/files/2800174331.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/96088592916.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/puxozaxaxexodubi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5275/9200/files/3804841606.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4443/files/30990415935.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/51749093528.pdf
    • https://cdn.shopify.com/s/files/1/0435/9412/1379/files/fekiligajopeve.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c7.bin
ef8a7e98173219e2bf5e9a2c2ecfad733f655d2852ae9f987eb49877eda376d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C7 5288 bytes
font_01_sfnt_off000068ee.bin
e3249e0bc462bb64d571af219f1fc64992fbff808aee232df2f3f29b1e662985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EE 14756 bytes

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