Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f3866d912a43de…

MALICIOUS

PDF

42.9 KB Created: 2020-09-03 00:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7559ccf8586669163642dcd80d0e16d SHA-1: d5b1e68bf513d459fa25ae97bad219f0d6cf4535 SHA-256: 24f3866d912a43deb4dcd68c1129a5beedabeb8500b4b465c7a8b9ad9a35671c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a redirector to known malicious infrastructure. The presence of numerous links, including to Shopify-hosted PDFs, suggests a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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/wix?keyword=adobe+spark+apk+mod
    • https://cdn.shopify.com/s/files/1/0436/2718/4281/files/active_and_passive_fire_protection_systems.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4416/files/ganesh_bhajan_video_3gp.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/rossetta_stone_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/61639513604.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/28252148775.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe94f2e60c24742a22fd68e94422d30.pdf
    • https://static.usrfiles.com/ugd/36f25b_77c0e226b35d41d4a8cc404abb5a00d3.pdf
    • https://cdn.shopify.com/s/files/1/0465/3308/3294/files/suxolejoxevobigezini.pdf
    • https://cdn.shopify.com/s/files/1/0462/8126/1205/files/dog_whistle_sound_app.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/2989566828.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/10582211284.pdf
    • https://static.usrfiles.com/ugd/0286dd_819d444d8a434be49a3d7cb6c06bd111.pdf
    • https://static.usrfiles.com/ugd/f99735_093432b4fbf14f32afbd347b43f6202a.pdf
    • https://static.usrfiles.com/ugd/23e9be_95a9b711b4014a7882bff6704981d709.pdf
    • https://static.usrfiles.com/ugd/60e703_2a3d8d84b0cc46c2845167627039fd01.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_off000061bc.bin
9bf571a5550c73ae014e2299c49014c84c3c11e4da65f40ea2ba6f9849459bc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 5268 bytes
font_01_sfnt_off00007389.bin
25dcdeda9fa07b7950157d287261b730470f5e7bada291e114c1952e1273c46a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7389 15740 bytes