Malicious PDF — malware analysis report

Static analysis result for SHA-256 255d327e57ac8926…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 09:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd9d3b3deeb0729d7fd80f3e73a3e271 SHA-1: 3bfb968b31c5f406c4e08e51b7ef95aaaa218ce8 SHA-256: 255d327e57ac892608f265665e5037ca4d84bd1e2f012db3ba7b145274728d75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, forming a link farm. One of these links, https://ttraff.cc/wix?keyword=la+investigaci%25C3%25B3n+cient%25C3%25ADfica+mario+bu, is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious infrastructure through a deceptive link farm.

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/wix?keyword=la+investigaci%25C3%25B3n+cient%25C3%25ADfica+mario+bu
    • https://cdn.shopify.com/s/files/1/0463/0426/4354/files/jemumizozavugagutetuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/63596995942.pdf
    • https://cdn.shopify.com/s/files/1/0430/9925/9031/files/man_of_medan_walkthrough_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/jafopamilinojejorifuref.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/75666951674.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/jemabuxiwesuviju.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/how_to_make_a_sea_lantern.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/punekadifidamaz.pdf
    • https://static.usrfiles.com/ugd/590778_12788598fdf7437d9fc76ee09eb68197.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdbfd45da51b41ff8c33ee0b174a7a53.pdf
    • https://cdn.shopify.com/s/files/1/0429/2621/1238/files/descriptive_adjectives_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/25983040691.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/whistle_audio_song_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/attachment_styles_in_relationships.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/nosuw.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ba.bin
49a68590912d4b33fd4e470a4a0e6f2d912599172bc9738bb7d238128692d74a
pdf-font-stream PDF embedded font (sfnt) at offset 0x66BA 5500 bytes
font_01_sfnt_off00007923.bin
2b1989cfb32fa9f1baac7a68169aea616cf76d7f3e9134cf6f94c5620b073324
pdf-font-stream PDF embedded font (sfnt) at offset 0x7923 11336 bytes