Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefb084ab1926202…

MALICIOUS

PDF

57.9 KB Created: 2020-08-30 13:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2b822d2cdfb28b44fb7277eb6032e48 SHA-1: 3a8cbe1ee14e933a2cdba104cd524c02d60ad27b SHA-256: fefb084ab192620250e40bf5d8a18070e58be845c0f0505e7288addb553d29b4
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links. The primary malicious URL identified is https://ttraff.cc/wix?keyword=organizadores+curriculares+primaria, which is likely used to redirect users to a phishing or malware-hosting site. No scripts were extracted, and the document body was heavily obfuscated.

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=organizadores+curriculares+primaria
    • https://static.usrfiles.com/ugd/b8c837_2be55c7e8b444c1fa019757a913632e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ffb51f4d6df4c81883c0a56039f58f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e02755ea7f64cb2ba3cd4a7f15fa134.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_744a88bc93f446d3b58bd53e7336cddf.pdf
    • https://cdn.shopify.com/s/files/1/0441/3269/6216/files/58867018384.pdf
    • https://cdn.shopify.com/s/files/1/0462/5789/7623/files/26468446817.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2753/files/81155410937.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/cutnell_physics_10e.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2819/files/vufasijofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5911/files/comma_worksheet_for_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0435/0899/0116/files/neoplasia_maligna_de_tiroides.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ac059802fc34f08872ac0a45fc587c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1ffb517261f4ccfa867406991f5cb14.pdf
    • https://static.usrfiles.com/ugd/63d3ad_8397f1320d284dc8b478c50227ec5416.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009940.bin
a63dc7203ceba2031beaf1d50b83973ffdd0483474384fa5780efc3deacec6ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9940 1696 bytes
font_01_sfnt_off0000a16a.bin
6cd6927ce9e76481d6f79f0f9ba495b2f50756bf41b52f2f191dd5d5dfd6358f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA16A 5472 bytes
font_02_sfnt_off0000b3ee.bin
2abfdf4d0bb24e032420ce698085bb6e7c152a519b3db204e568eaaf994b42fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 11200 bytes

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