Malicious PDF — malware analysis report

Static analysis result for SHA-256 938967232bca6756…

MALICIOUS

PDF

37.4 KB Created: 2020-08-03 14:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eefa8787b22c8bccd71d6b77c9621d2b SHA-1: dfa2967439df07422a44ce9b4a7e05808f3a2810 SHA-256: 938967232bca6756e1b6ede7ab250e30a108623534fdbf2676f4d4b180702e39
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, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=how+to+swing+trade+brian+pezim+pdf+free+download`. The document body, though heavily obfuscated, contains keywords related to trading books and the tool used to generate the PDF, reinforcing the 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=how+to+swing+trade+brian+pezim+pdf+free+download
    • http://files.quickstitchplus.com/uploads/1/3/1/4/131406222/4713347.pdf
    • http://files.polishedbysterling.com/uploads/1/3/0/8/130813997/7910816.pdf
    • http://files.vitalnutritioncapecod.com/uploads/1/3/1/6/131606118/fewuxemijude-ninozifakax.pdf
    • http://files.belgicans.com/uploads/1/3/0/7/130775544/550584.pdf
    • http://files.culturalartnetwork.org/uploads/1/3/1/1/131163550/2350439.pdf
    • https://cdn.shopify.com/s/files/1/0438/9984/6824/files/principles_of_modern_chemistry_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/91512381642.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/34156305992.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/27049372432.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/givoguzeluxiduwulewisovo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5102/2501/files/20090793711.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/kiwugaledovatagesak.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/9180253303.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/74137531739.pdf
    • https://cdn.shopify.com/s/files/1/0430/3706/5370/files/tafolatuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/midetidoso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puwojadudabub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.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_off000052fd.bin
2e10a7debed502898a25592946042f32c79900e8fa6d48336b803adfa42f6a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52FD 5604 bytes
font_01_sfnt_off0000660d.bin
754965a7da3a4fb9feb2f26decd244aa139560f3fc3f814e0dc8e7205af3788b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660D 10100 bytes

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