Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e644cd3285bddf9…

MALICIOUS

PDF

67.1 KB Created: 2020-10-02 23:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8403812ef672469bffcef29faa903899 SHA-1: 736421d764d03bfce69a2210bd403152a9baefe1 SHA-256: 0e644cd3285bddf93294aa2746ca14dc126eefd4f5a6fcc556c822097bc3c071
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of SEO poisoning or a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'ggtraff.ru'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the lure.

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://ggtraff.ru/strik?keyword=keith+ferguson+bass In PDF document text
    • https://site-1037218.mozfiles.com/files/1037218/24328104403.pdfIn PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/ruzunofi.pdfIn PDF document text
    • https://site-1036661.mozfiles.com/files/1036661/zuresabozepuwufigotuwuwi.pdfIn PDF document text
    • https://site-1039505.mozfiles.com/files/1039505/58937567692.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/lejosalivepowugojijizirex.pdfIn PDF document text
    • http://sunilido.maplematters.com/uploads/1/3/2/6/132681670/9670362.pdfIn PDF document text
    • http://files.iambriannna.com/uploads/1/3/1/4/131453902/fabikovimudabaliwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/phonetic_spelling_of_your_full_name.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0676/6488/files/65906130194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/dowukevanoderupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/tall_ships_race_turku_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/vomexufofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6295/8997/files/the_bee_bl2_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/dime_piece_urban_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5015/6700/files/domeg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 5104 bytes
SHA-256: d4b9cf230de99985c1160431adcb65e90d570ffac760cd9b63fc7996e2e0ba72
font_01_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 10600 bytes
SHA-256: d95c729bf1011c80bcf96028ad037e4b565a871fcb07afd66bb0fa2b8a7a4329

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