Malicious PDF — malware analysis report

Static analysis result for SHA-256 d837784d7b119c33…

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 04:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b4e6b686edee3fda70544d2834cd2b1 SHA-1: 67c4ad0ef6f46dff75f6977b4818f25af614a653 SHA-256: d837784d7b119c33e435274542672f3d038faefed7306f6cd481eb480d69f6f7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=how+to+use+osa+skyrim'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the lure.

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=how+to+use+osa+skyrim
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/nitakuwamexotanupumetuxos.pdf
    • https://cdn.shopify.com/s/files/1/0462/7103/7602/files/28396420814.pdf
    • https://cdn.shopify.com/s/files/1/0440/6935/5670/files/28669063833.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/95514310651.pdf
    • https://static.usrfiles.com/ugd/b8c837_844f99191be048459ebf93f46e03fc78.pdf
    • https://static.usrfiles.com/ugd/b8c837_08d055e20f954efa84331490402bc89e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d425d4761e074087b1b98244ea59af43.pdf
    • https://static.usrfiles.com/ugd/18f527_9441ebc2de5e4a0d89880b551a8df145.pdf
    • https://static.usrfiles.com/ugd/b8c837_882974bfd91d4483abc4bc256aa23e76.pdf
    • https://cdn.shopify.com/s/files/1/0436/0673/7053/files/l_anti_oedipe_capitalisme_et_schizophrnie.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/wotagosugesovapiwoxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/sidozumud.pdf
    • https://cdn.shopify.com/s/files/1/0436/0463/9907/files/97848663717.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_off0000684b.bin
e78d2a5ccda47bbea7077924b3d2aa1741892fac59d483d747b90c7003f0acff
pdf-font-stream PDF embedded font (sfnt) at offset 0x684B 5016 bytes
font_01_sfnt_off00007958.bin
fe6e882330d62b3a37431b97a07c1caa59a3ad14a299f38e9ac4d626f8e82afe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7958 10344 bytes