Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94743ad91a0a0cb…

MALICIOUS

PDF

55.3 KB Created: 2020-08-07 19:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7cfbeb19ebde38b37551c2d5337cb95 SHA-1: e907a5f2610349e71a47d185da9ee91782cf573d SHA-256: a94743ad91a0a0cb4d4fb615f5940c046a57cff93d3adab7e74956edb025233d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL. This indicates the primary purpose is to redirect the user to a malicious site, likely for further exploitation or credential harvesting. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=basic+algebraic+geometry+2+pdf
    • http://files.vettoriofficial.com/uploads/1/3/2/7/132710797/rekekavos-tixeligexewe-gudomevivefaso.pdf
    • http://files.moviemanmdg.com/uploads/1/3/0/7/130740200/4461911.pdf
    • http://limun.latorreholidays.com/uploads/1/3/0/7/130775868/67b5b837565c21f.pdf
    • http://files.washingtonpedic.com/uploads/1/3/1/8/131871433/507746.pdf
    • https://cdn.shopify.com/s/files/1/0430/0763/9711/files/fajenixizugudevigutumasef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/lukesavobidunuwoxijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/dividing_rational_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/arma_3_single_player.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/2020_qld_school_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/gatatajamodapaxodux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/momakaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/munipugiradunikuxajasifa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/82888915197.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_off000097e4.bin
49d09eadc860be0cb1490967a699728b420a440975dbbee42088fcf0fc9cc2b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x97E4 5896 bytes
font_01_sfnt_off0000abe9.bin
bb8e7427801863d6f55a5ae45f89a902fba0ad95cfe18fff2995b7892ae6baf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xABE9 10588 bytes