Malicious PDF — malware analysis report

Static analysis result for SHA-256 793355158603c47b…

MALICIOUS

PDF

55.7 KB Created: 2020-07-30 23:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce7f99020d7f8e7056ed174f6187156 SHA-1: 757b03aac09b6795f7026bb86f4282c3ee210f15 SHA-256: 793355158603c47bf54ce26650325d8e0b5b6f5a6fdc211a567f4e5d72980edb
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. 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. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious intent. No scripts were extracted, but the embedded links are the primary vector for malicious activity.

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=axioms+of+communication+pdf
    • http://files.washington-scottish.com/uploads/1/3/0/8/130874318/8b0f395751b7b3.pdf
    • http://files.queensweepers.com/uploads/1/3/0/7/130775850/napuligivefe.pdf
    • http://files.xtremepaintbody.com/uploads/1/3/0/7/130739029/4178b4.pdf
    • http://files.gracetotheground.com/uploads/1/3/1/3/131379496/888574fb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/ganajulazexutuzafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/38955999492.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/zoruzuwifelixufesasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/rovokopafovodezinololi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7602/6522/files/70705598086.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/savapovorok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/66561496110.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/51459280933.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/xopuvuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/puropu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/wafaguxamofarodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.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_off00009d1d.bin
431edb787b78196572c724b9fb202ab51151cf2070490b376208080335f6f38e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1D 4996 bytes
font_01_sfnt_off0000ae05.bin
c6b9ae3306496cc0ae60882dbf8d92b1128405762c06f19d66ba74ed73ae28e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE05 10380 bytes

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