Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dd637f0a33e489…

MALICIOUS

PDF

43.5 KB Created: 2020-08-25 07:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39eb48e81db0728ff87b0aab7f8aadb0 SHA-1: e0f09e131bf5f501b176706a5a9183c4b4cffa2f SHA-256: 84dd637f0a33e489bf18c432b211a90c7046a1107b7375a2d1d10366b00914cb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector (ttraff.ru). The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, including those pointing to Shopify domains hosting PDF files, suggests a link farm or SEO poisoning tactic to lure victims. The document body itself is heavily obfuscated and contains the malicious redirector URL, indicating an attempt to disguise the 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.ru/pify?keyword=medical+tourism+report+pdf
    • http://files.blueridgepokemon.com/uploads/1/3/1/3/131382387/pobujabalofek.pdf
    • http://files.ridgeandvalleyforest.com/uploads/1/3/0/7/130775017/6ac8ac68543e.pdf
    • http://files.pauljhamel.com/uploads/1/3/1/4/131453684/movupezoxobuviwaj.pdf
    • http://ropagidi.dorispinks.com/uploads/1/3/0/7/130776485/govoruwafolinonafik.pdf
    • http://files.alayorkritepha.org/uploads/1/3/1/6/131606694/fopotenokavej-lomufip-zodonamasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/portfolio_templates_for_designers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0823/files/grade_2_english_worksheets_comprehension.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/10200132931.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/basic_applied_mathematics_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/poniwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/9592789046.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/81046319824.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/danedanadiwapizemepegare.pdf
    • https://cdn.shopify.com/s/files/1/0440/8911/4789/files/72794181053.pdf
    • https://cdn.shopify.com/s/files/1/0465/3747/4198/files/fuvejaxokirezukeku.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_off000069c1.bin
28519108ee817a25e342751fcf2f9759a34a62a8681505db8b8dd103557a9830
pdf-font-stream PDF embedded font (sfnt) at offset 0x69C1 5304 bytes
font_01_sfnt_off00007bb3.bin
f43e725d2b606de81344915b0bd510cce09ea4034a9e3b1af63e26d2f7c720d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB3 10900 bytes