Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcd8722c2640c8a…

MALICIOUS

PDF

34.6 KB Created: 2020-08-05 19:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d03789fcf3d8c81b9e7d6756f2879a20 SHA-1: 8dee4a972c73b20f77de9d8c08b43990e0259242 SHA-256: 0dcd8722c2640c8ab4538307788ddb5480385ee862c03ec1a656fe3cbd224297
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, forming a link farm designed to direct users to malicious redirector infrastructure. The primary lure appears to be a "convert photo to PDF" utility, which ultimately leads to the malicious URL https://ttraff.com/wb?keyword=convertir%20foto%20a%20pdf%20a%20word. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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/wb?keyword=convertir%20foto%20a%20pdf%20a%20word
    • http://files.australasianhumanbiology.com/uploads/1/3/1/4/131406352/pibawefumivujugediz.pdf
    • http://files.dougsbmr.net/uploads/1/3/0/7/130740049/2013812.pdf
    • http://kibopafos.localgestures.com/uploads/1/3/0/8/130873822/4ec17e.pdf
    • http://files.fleischerallstars.com/uploads/1/3/1/1/131164002/fukuxa_poripaxuvelativ_dedujox.pdf
    • http://files.1169certified.com/uploads/1/3/1/1/131164174/6101979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/32919606297.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/23177399124.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/guxulokadowosov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/32038065892.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/21190126771.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/kexudiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/fegixewamazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/susuzorekuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0146/2436/files/tofirijidomakupeweliweb.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047d3.bin
8edd620505501161ad32ef80fb153a6e1f5ecd376454354260a8d62d81dc7eea
pdf-font-stream PDF embedded font (sfnt) at offset 0x47D3 4884 bytes
font_01_sfnt_off00005892.bin
be9629b2f1c2f5b1aeec8b720ecf51cd68c706f44cd7fa0be9cc3cac71ec75e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5892 10868 bytes