Malicious PDF — malware analysis report

Static analysis result for SHA-256 6224afa4fd837eed…

MALICIOUS

PDF

33.8 KB Created: 2020-08-23 01:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4d9c83456b37f3360cfe7218789333 SHA-1: cfbc9c7bbc88643ff7ffe5b079d0ce8dd04bdb0f SHA-256: 6224afa4fd837eed8486c75c7983906a573738f764ce2323903a5cc1d907069d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document body, though heavily obfuscated, contains the same URL and references a worksheet, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links also points to a link farm or SEO abuse tactic.

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.com/pify?keyword=asa+congruence+postulate+worksheet
    • http://soseniwe.lifetimeepoxyfloors.com/uploads/1/3/0/7/130776321/0fb88f3881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/equal_arm_balance_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/1459/2408/files/51366498011.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/48447793282.pdf
    • https://cdn.shopify.com/s/files/1/0462/7732/9056/files/forrest_gump_main_theme_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/chrome_extensions_all_files.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0435/8357/0078/files/chippewa_flowage_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0463/0708/2402/files/12826050363.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5987/files/livro_biotecnologia_industrial_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/91705878039.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/aquaculture_lecture_notes.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_off00004832.bin
e448d20d879298bf4414a0a695c6cabe92ac7bbd28f2fc42e4d13272dc93f628
pdf-font-stream PDF embedded font (sfnt) at offset 0x4832 5340 bytes
font_01_sfnt_off00005a60.bin
88e7418e881a7b71f87f18cd30535039d8e19d323a6e9ba9cccd42f51b18e48b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A60 9440 bytes