Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf2353287f431c4…

MALICIOUS

PDF

49.5 KB Created: 2020-08-18 18:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f280ca1042c3b8bbd27fb3a6aa01f540 SHA-1: 1181dad7ab64fb9965d463b04595b7d50a8d6a57 SHA-256: fbf2353287f431c49060684eaec1fafe6d718be06b4a5b2020ded386eb68077f
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'home carer tax credit form 11' and the malicious URL itself, suggesting a phishing lure. 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.ru/pify?keyword=home+carer+tax+credit+form+11
    • http://files.listeningground.org/uploads/1/3/0/7/130776158/delakuxuposomoje.pdf
    • http://files.rebeccajaynephotography.com/uploads/1/3/1/1/131164252/2805746.pdf
    • http://files.rollingroses.com/uploads/1/3/1/0/131071137/dapix_putej.pdf
    • http://files.thevaccinationclinic.com/uploads/1/3/0/9/130969508/nepazedevu.pdf
    • http://files.springfieldvermontumc.com/uploads/1/3/1/0/131070035/1574741.pdf
    • https://cdn.shopify.com/s/files/1/0449/9125/0590/files/biblia_reina_valera_1960_para_celular.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/98602041122.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9127/files/baraleninipudek.pdf
    • https://cdn.shopify.com/s/files/1/0446/9637/1356/files/37102991651.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/93697287184.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/85788305583.pdf
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/51121425470.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/cengage_chemistry_books_for_iit_jee.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_off0000839f.bin
8098a9f09f9a66389b21471c4d9f75512e1c41a384122ff99d13a2212eeb6f40
pdf-font-stream PDF embedded font (sfnt) at offset 0x839F 5040 bytes
font_01_sfnt_off000094af.bin
ce426ebd3ec64f0a578b0523a188cd0acc8dbc318a6180b9f39d49a0cb31b22c
pdf-font-stream PDF embedded font (sfnt) at offset 0x94AF 10748 bytes