Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdc7911b745fbc5…

MALICIOUS

PDF

56.5 KB Created: 2020-07-29 20:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c1a8bac4208570ae2fed9da6637cd1 SHA-1: ecc7fb2987f9047d2df3d5544e8079d5422e4861 SHA-256: dcdc7911b745fbc565b180be91fc8b0140b7cd81a7346246d9d8c9f592d2a154
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the primary one leading to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Articulo de l carnitina pdf' and wkhtmltopdf, suggesting a lure document.

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=articulo+de+l+carnitina+pdf
    • http://files.yaksaks.net/uploads/1/3/1/4/131438038/589956.pdf
    • http://files.vitalmoves.net/uploads/1/3/1/3/131384635/c82b840f83eb5f7.pdf
    • http://files.bristoldentalsociety.co.uk/uploads/1/3/2/6/132695372/9582018.pdf
    • http://files.vernerearlylearning.org/uploads/1/3/0/8/130814586/xupepozus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/kipodedes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/saxomorebiwebodir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/21677454034.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/fofifitobiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/manevoresorakevigerokiwes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/sijisitolibizixubolake.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/71799463472.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/78744081514.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8100/files/sekexananirefig.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/novuwobefowenikezid.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/76218060050.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/
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/manevoresorakevigerokiwes.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a110.bin
a7e0991f32242e7ddc943918f5bdf3e8d3a2c7f7ccfa20dce31a9eb87f2c3f90
pdf-font-stream PDF embedded font (sfnt) at offset 0xA110 4844 bytes
font_01_sfnt_off0000b18e.bin
98cc0f270170b68955ccca77475d9cf376147239c517752d32d12fc7fd8393b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 10336 bytes