Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e671fab2bac0a1…

MALICIOUS

PDF

42.1 KB Created: 2020-08-25 05:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4adc0b7e81f8ff70a9053cf36be8d51a SHA-1: e85e62dcb2220bcd6b6b690bed6f503c430c17f3 SHA-256: 75e671fab2bac0a102a6bd6a19859b4ccd53ffe29488c8cc929bfc675675f043
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, includes text that appears to be a lure related to game guides, aiming to entice users to click on the malicious link. 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=ragnarok+m+eternal+love+characters+guide
    • http://bajotux.crimsonmist.com/uploads/1/3/1/3/131383309/9736991.pdf
    • http://files.conciearth.com/uploads/1/3/1/4/131453555/b5fabe.pdf
    • http://files.traceyquezadaproductions.com/uploads/1/3/0/8/130874001/3772817.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1828/8284/files/microprocessor_and_assembly_language_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/92989471612.pdf
    • https://cdn.shopify.com/s/files/1/0430/8244/9045/files/ase_a1_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8375/files/form_to_apply_for_irish_passport.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/rawosuvoxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/46245171893.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/35412927168.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/42092538530.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/zotel.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/waxisatem.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1079/files/8064957391.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_off000065e6.bin
9b4e837e6a2c23bedda852b23f444d321a1d51e7568f62783cc165ff69d242ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E6 5484 bytes
font_01_sfnt_off00007864.bin
dec15bc8af02be545d6fda46e12807d71e8babda0cd8c3503359fe59f49096e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 10308 bytes