Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b2bf0dfe87c027…

MALICIOUS

PDF

48.3 KB Created: 2020-09-01 07:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61adddf09157b82dca911006c8737080 SHA-1: 35539fc890864b67611b1069a7c7522a078060fa SHA-256: 73b2bf0dfe87c027b809a5168d38600251d9f4e5e4c9db04aa000324ffe48800
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=hormone+replacement+therapy+australian+guidelines'. The ML classifier strongly indicates maliciousness, and the document body, though garbled, contains text related to 'hormone replacement therapy australian guidelines', likely a lure to encourage clicks on the embedded links.

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=hormone+replacement+therapy+australian+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/5611/0495/files/logotherapy_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/cerazette_mini_pill_information_leaflet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/94303402788.pdf
    • https://cdn.shopify.com/s/files/1/0428/8200/7199/files/gijadirux.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9070/files/easy_popular_piano_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7528/files/zoology_book_for_bsc_1st_year.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/sodexekix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/93818216621.pdf
    • https://cdn.shopify.com/s/files/1/0431/4641/2188/files/49347575587.pdf
    • https://cdn.shopify.com/s/files/1/0438/1527/2605/files/84112545621.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2439/files/12212464333.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/meveguxevoto.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_off00007082.bin
57ca791ff31921337dfece213e3ec717153a8055e5e5a7c79bda3e945576522b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7082 5432 bytes
font_01_sfnt_off000082c5.bin
7e5f244061a0d5c547683bfb6c5ce243169f448ed3b7c429feead57355c3d63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C5 10312 bytes
font_02_sfnt_off0000a613.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA613 4324 bytes

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