Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38b9f728d5f6c22…

MALICIOUS

PDF

46.4 KB Created: 2020-08-19 23:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37164d094a9c3530396b2344894e6b2a SHA-1: 2c39acd9c84a428eb59b63e9f3944c28e9b2c46d SHA-256: f38b9f728d5f6c223ceb8017c260afb383cfca4f74dfd28e40454afbc3da1e79
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 of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is disguised as an 'ableton live 9 reference manual'. This indicates a social engineering lure to drive traffic to malicious infrastructure. No scripts were extracted from this sample.

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=ableton+live+9+reference+manual
    • http://mavilabal.mommabearkeepsakes.com/uploads/1/3/0/8/130814297/3507659.pdf
    • http://files.enableuc.org/uploads/1/3/2/3/132303007/6561100.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/kojiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5821/files/bolivia_water_war_project.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4789/files/reriworoxej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8514/files/jivopuworul.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6088/files/98091154593.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/65245932309.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/20404669240.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/vixaxexozif.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/97442790845.pdf
    • https://cdn.shopify.com/s/files/1/0450/2791/7974/files/actual_evapotranspiration.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/vafinigazelipoxozeb.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_off00006c71.bin
c4d653a385486889f9e45069909213610b68e567427242ecb2838a0535922fec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C71 5192 bytes
font_01_sfnt_off00007e08.bin
35d57727f1b3ee628341cb969c7e3a46ece719b2fb963b9699d2610d56b9ca5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E08 15128 bytes