Malicious PDF — malware analysis report

Static analysis result for SHA-256 73312c478488b8a8…

MALICIOUS

PDF

53.8 KB Created: 2020-08-10 19:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b17e057043f887d275ef6641ab78fe18 SHA-1: 88dbb4d9dda04e043baf6310d31be58dc11ea60c SHA-256: 73312c478488b8a82f3f05e513615adcb0155df83a39fc31823924bdc26f3c46
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which points to `https://ttraff.cc/pify?keyword=f%25C3%25A1rmacos+antiarr%25C3%25ADtmicos+pdf`. This URL is designed to redirect users to further malicious content. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt to distribute malicious content.

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=f%25C3%25A1rmacos+antiarr%25C3%25ADtmicos+pdf
    • http://files.artandhow.com/uploads/1/3/1/4/131482991/mawedanelovibe_dugis_vawuratez.pdf
    • http://files.ceramicspaintingstudio.com/uploads/1/3/0/9/130969446/7863727.pdf
    • http://files.lisasturm.com/uploads/1/3/0/7/130740412/niresufijoxusagepa.pdf
    • http://files.ourladyoftheadirondacks.com/uploads/1/3/0/8/130814132/gatosenolunine_besovulurun.pdf
    • http://purelep.ciciliani.com/uploads/1/3/0/7/130775350/6256267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/1922/2687/files/sql_query_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/tubufaxuzemilepawosote.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/busiwudovogoduragukoruz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7060/3932/files/8836649688.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0435/7917/9171/files/bwssb_merit_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/56221053093.pdf
    • https://cdn.shopify.com/s/files/1/0432/2711/9784/files/72719505650.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/52399878722.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/dapobemuginufadigug.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/kross_fire_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8050/files/60246609003.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/wivebokesijasolokolefedi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083da.bin
33bff1a9390bde045a1fc862cd320505fec2daf014de22100923208bcb26df98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DA 5180 bytes
font_01_sfnt_off000094ba.bin
d4f689de89c6e5d4803dfc192927fbe2b29185314c8eb86672e09a4197babcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94BA 11676 bytes
font_02_sfnt_off0000b9bb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BB 4324 bytes

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