Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf7dae8e63c4c69…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 17:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f04b39a4b6893e9082ad5a4c7223116 SHA-1: 724f1d870fc4deb10735a92140e55c6499fd07e2 SHA-256: ddf7dae8e63c4c69e06daf28d67351e0b70285fc631839c97aebca1f32b73ced
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.com, a known redirector. The document body, though partially corrupted, contains the same URL, reinforcing the malicious intent. 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.com/pify?keyword=applications+of+non+aqueous+titration+in+pharmacy+pdf
    • http://files.1stclasshomeopathy.com/uploads/1/3/0/8/130874416/zosibazugokibev.pdf
    • http://sokubi.walkingmeditation.eu/uploads/1/3/1/4/131452836/58bf743acc35f9.pdf
    • http://files.artandsoultimmins.com/uploads/1/3/2/7/132740435/nemuti-dagututinuraz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/lulirimar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0197/files/38952693574.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/materiales_metalicos_ferrosos.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/nijixemizijosudutoxebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonexosorovofevovu.pdf
    • https://cdn.shopify.com/s/files/1/0448/0398/1463/files/aminofilina_injetavel_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8892/files/vikanerujuzumabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/18961823576.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/lg_v20_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/94806340589.pdf
    • https://cdn.shopify.com/s/files/1/0454/3217/6808/files/65117724852.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_off00006367.bin
4270c3dccf1305a359dc1f98cd965e153ab4f29535f8a59fd1bab0a3b8b06a2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5612 bytes
font_01_sfnt_off0000765c.bin
5240df55f17e7493595b18deca0ca232652b785e58818d308febfc2a34748032
pdf-font-stream PDF embedded font (sfnt) at offset 0x765C 13476 bytes