Malicious PDF — malware analysis report

Static analysis result for SHA-256 723d8772801258e9…

MALICIOUS

PDF

52.8 KB Created: 2020-08-17 16:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83f9ffc294e8647d89ab51fbba6389fa SHA-1: 29fbc9306f079646f742d29e684dbce81b079b94 SHA-256: 723d8772801258e92f49812204b21be5e751045c111551d45848d24d79d01e7c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. The document body, though partially corrupted, contains text related to 'travel guide hanoi vietnam' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness.

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=travel+guide+hanoi+vietnam
    • http://files.halloweeninthehills.com/uploads/1/3/2/7/132740277/9902579.pdf
    • http://files.whispersisterstudio.com/uploads/1/3/0/7/130775868/juwufizabubimu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/avery_business_card_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/56134907414.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/kuwigiwuzeturadowadod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35031547028.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/34201552349.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/60400805857.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/wasameja.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/navewepenizuwuleromaj.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_off00008685.bin
1a2fbda6d4927da8d79563ff49fe7167a38d0310605703f1b644b02883b43857
pdf-font-stream PDF embedded font (sfnt) at offset 0x8685 5072 bytes
font_01_sfnt_off0000978d.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x978D 1800 bytes
font_02_sfnt_off0000a01b.bin
eaa8b0cd7ba5a94111776fdb96fa4f2205dd7932accd6679594bf2dddbf2374e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA01B 11472 bytes