Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e560373314a4fb…

MALICIOUS

PDF

47.9 KB Created: 2020-08-07 08:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 504c0084058c659896354829981524ca SHA-1: eab5f13a13cebe189eaf4c2311a0ae8612d94939 SHA-256: c7e560373314a4fba01a62c91fb49b7ffb5487476470f5b48a715cbb09534f72
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure, suggesting an attempt to funnel users to malicious content. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, contains text related to French adjectives and references the wkhtmltopdf tool, potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=tous+les+adjectifs+fran%25C3%25A7ais+pdf In PDF document text
    • http://files.atemainc.com/uploads/1/3/2/8/132815924/papififoja.pdfIn PDF document text
    • http://negivum.dutzowballpark.com/uploads/1/3/1/6/131636725/787151.pdfIn PDF document text
    • http://files.aceshighhobbies.co.uk/uploads/1/3/1/3/131379420/cf90ee61592.pdfIn PDF document text
    • http://magugevu.thechurchtaxexpertsofamericallc.com/uploads/1/3/0/8/130814328/muxekumefigo.pdfIn PDF document text
    • http://files.mysciddoc.com/uploads/1/3/0/7/130740522/dc1ff1f5f651.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/1/0437/2794/5879/files/blanket_supplementary_feeding_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/66863669386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/napuburoborivaziwataze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/fijewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/pexuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/70550898919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/24562998551.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/36354292320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/download_word_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3016/7207/files/lolotedijogelifukikize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/laledakolapireropoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/tadokiwitu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B97 5356 bytes
SHA-256: a4aed544774c922a35ec9e28aea7eb1527dd3f491db8d51d4b618de3c43fbed5
font_01_sfnt_off00006d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9E 14992 bytes
SHA-256: 43890ca75dc32d499ae7cefa92ee2cfac5979cae1bb4f137655f7cd23c9f0f9f
font_02_sfnt_off00009b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5E 16080 bytes
SHA-256: d7c0313d84b709fe8a6a90baca56b34c20eeda1db47cffc02c31991c89a68c0d

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