Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7d4abb0c231143…

MALICIOUS

PDF

43.4 KB Created: 2020-08-08 04:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2f660b654b719e00f3972bda4beafb8 SHA-1: ca538ad3ad09c1c3e475cb90550f025e3a45b330 SHA-256: fa7d4abb0c23114368843946038ab2dd7485bae3858288b99be9e42e1f882c3a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, including a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a "Hanuman chalisa aarti pdf" lure. The primary malicious URL, https://ttraff.cc/pify?keyword=hanuman+chalisa+aarti+pdf, is identified as a malicious redirector, indicating an attempt to lead the user to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=hanuman+chalisa+aarti+pdf
    • http://masegubu.campingdeberghoeve.com/uploads/1/3/0/7/130776394/8830673.pdf
    • http://files.amysloot.com/uploads/1/3/0/9/130970001/bunigudojonipigepa.pdf
    • http://files.ochsbass.com/uploads/1/3/1/4/131411539/8610269.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/fexutoxuro.pdf
    • https://cdn.shopify.com/s/files/1/0427/9966/1223/files/xedasul.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/alkanes_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/4911607902.pdf
    • https://cdn.shopify.com/s/files/1/0436/4615/6960/files/sixegejonixowuvakubutasu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/penilo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9087/7339/files/34595404538.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/mevata.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/vehicle_dynamics_gillespie.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/baixar_possuida_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/4968866294.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/xurer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/sajupafewuk.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_off00006a35.bin
af9ad8abff432046f299e98e7f9111a6ded4485f55fe73f56fc581a207efcdc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A35 5356 bytes
font_01_sfnt_off00007c3b.bin
7f6559c8de310c25c1e0258534c2ee59b1cabfcdbec7308d3ddf4f7782269237
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3B 10604 bytes