Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c3699278d25187…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 08:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0addfb1b61ae9a8690be4405dbcad64c SHA-1: 53b897740b9fa576d2102814e309f0758034f3a6 SHA-256: f4c3699278d25187830b369a3d52cb6b47e4fb4766b6efb20430f5754324177b
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to other PDF files hosted on cdn.shopify.com. One of these links, however, directs to a known malicious redirector at 'ttraff.cc'. This suggests a link-farming or redirection-based attack, likely intended to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=hein+gericke+size+guide
    • https://cdn.shopify.com/s/files/1/0432/4818/9595/files/shreemad_bhagvat_geeta_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/mofozowamud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/37743435112.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/suvofadirabetazakimusux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/es6_abstract_class.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9879/files/jumixutavodotosik.pdf
    • https://cdn.shopify.com/s/files/1/0433/5822/4549/files/dapalomolumamijid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/expanding_brackets_and_solving_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/the_art_of_war_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/lefuguma.pdf
    • https://cdn.shopify.com/s/files/1/0439/2543/8619/files/wimitomakuro.pdf
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/tuvosabipelaba.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_off00005c6e.bin
db593f4f5b250b649f291a6448e0e68a96b404715d54327dc8210f985fcc77c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6E 4940 bytes
font_01_sfnt_off00006d51.bin
b39ca9f2f1352de5133e16391f3b27d3ae8d05cf01818577ebbd60d97fa0d696
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D51 10852 bytes