Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58877b97b2d9176…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 08:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0af8a4be0fab3d743e0bf780b8bee06 SHA-1: 2669d5714c0c62aebb37b0b1eb9e38aca6cbcebc SHA-256: a58877b97b2d9176a5ef2d047604113621e0d0b546877f080993dca03331e811
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.cc/wix?keyword=principios+basicos+de+programacion, is flagged as a malicious redirector. This suggests the document's purpose is to lure users into clicking these links, potentially leading them to malicious sites or further compromise. The ML classifier also strongly indicated maliciousness.

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=principios+basicos+de+programacion
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0463/2861/0971/files/61244717300.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0074/files/pirates_of_the_caribbean_theme_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/bozekaxawasujosud.pdf
    • https://cdn.shopify.com/s/files/1/0463/2379/4077/files/paxagebogaketubewumum.pdf
    • https://cdn.shopify.com/s/files/1/0435/5561/8977/files/35668352677.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/xemugepejekanusasowutekiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2434/3462/files/54773675974.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdf
    • https://cdn.shopify.com/s/files/1/0447/9864/0288/files/20881986082.pdf
    • https://static.usrfiles.com/ugd/538d67_81ac40bfd4014977864b471ee9c39ee1.pdf
    • https://static.usrfiles.com/ugd/769f78_fed36ae20bda4a7d83989d557220976a.pdf
    • https://static.usrfiles.com/ugd/9a242c_51a30fb562164234bf63b29cdc5ec182.pdf
    • https://static.usrfiles.com/ugd/4f270c_18d9d650aa44466d814cb5f5fe6fa342.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_off000064a8.bin
e143ccdd2f656e949b10823688565fea5b44beb2649f44d84376bd7901abcd1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A8 5500 bytes
font_01_sfnt_off0000772b.bin
600fe78229e239fb439fb9cbcdff43dd107687c0e026f3a9509d05622e1bdf3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x772B 15348 bytes