Malicious PDF — malware analysis report

Static analysis result for SHA-256 942ed769741dd13a…

MALICIOUS

PDF

44.3 KB Created: 2020-10-05 08:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ddb36a35cdfdc47893b81a7fd7d1cb3 SHA-1: d86a303e9f44013ccdfc954001142cd372f7b63b SHA-256: 942ed769741dd13ad8da4d7c99946f3eb6089a869c534a2a8d28e954410bb886
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 of which point to Shopify-hosted PDF files, likely as part of a link farm. One critical heuristic identified a redirector link to 'ggtraff.ru', a known malicious domain. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a reference to the malicious URL, suggesting an attempt to disguise the malicious intent.

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/pify?keyword=complete+alchemy+and+cooking+overhaul+hunterborn In PDF document text
    • http://files.ncce-learn.co.uk/uploads/1/3/1/3/131380504/0b3b95265648c.pdfIn PDF document text
    • http://jasip.typebtriathlete.com/uploads/1/3/1/0/131070240/jumelefilewugakugita.pdfIn PDF document text
    • http://woduk.myprovidenceconstruction.com/uploads/1/3/1/4/131438245/wunotutixek-xezijimosevuxu-jagonabusifa.pdfIn PDF document text
    • http://pajot.edgertoncentermakerspace.com/uploads/1/3/2/6/132695540/3ffaea32430.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/71601669883.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/nepiwazonalem.pdfIn PDF document text
    • https://site-1037196.mozfiles.com/files/1037196/kidatoriderebevipiko.pdfIn PDF document text
    • https://site-1038472.mozfiles.com/files/1038472/1331008882.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/1/0434/3254/2369/files/captain_b._mccrea_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/west_haven_veterans_administration_hospital.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/62489099948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/el_hombre_y_la_sociedad_ensayo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/clash_of_queens_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/44005596994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7553/4488/files/happy_birthday_fonts_calligraphy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/gujuni.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_off00006de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE8 5580 bytes
SHA-256: 03f03632573703da645eceb29c205e98423299d59270017a75452b97ccbd3474
font_01_sfnt_off000080b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B8 10292 bytes
SHA-256: a4c84321172f25a45d2a7afa8d86d0ff1a41a9c0a9319abb65f51bfe865f5140

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