Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc8519a0763e2ed…

MALICIOUS

PDF

37.5 KB Created: 2020-08-24 22:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09abf09e35d955879a97d8e817d24993 SHA-1: f9313ad0d4e7922a8a8ea4843d05e8a18c60229a SHA-256: 1fc8519a0763e2ed92863c3920256538a0494081f1a4e8e84b2a1c712b1d39c2
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a "Bow valley college apa template" and a large number of other links, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.com/pify?keyword=bow+valley+college+apa+template
    • http://files.cebhalifax.com/uploads/1/3/0/7/130740490/6934934.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/80208524053.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/69053021429.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/busojufelaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/3593/2310/files/one_touch_ultra_mini_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/7457/6533/files/aplicativo_para_baixar_musica_no_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/mewiparejosovizim.pdf
    • https://cdn.shopify.com/s/files/1/0439/6787/3182/files/adobe_after_effects_free_project_files.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/62184762443.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/wimufuja.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/ridakulifojafafugemofar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/paula_isabel_allende_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048c2.bin
7fae0b3966a11658ada2279c729c9451f09c28a1469cc415cc5d645273344471
pdf-font-stream PDF embedded font (sfnt) at offset 0x48C2 4916 bytes
font_01_sfnt_off000059a5.bin
8a3d758d04288205b986aa06ef99ff16f91766e08a264129ca229afdad8bd527
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A5 9816 bytes
font_02_sfnt_off00007b38.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B38 4324 bytes