Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d5571828b36e64…

MALICIOUS

PDF

46.4 KB Created: 2020-08-08 11:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb65610fa68d48dacf24d5a6ee59411f SHA-1: 3077a4820a2b25d440746a3c0ebbd4ee4e2f2382 SHA-256: b6d5571828b36e648d7bca430f9d347501b455b263ee3fedb663e2c145d021b8
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link redirecting to known malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though corrupted, contains keywords related to the malicious URL, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further stages of attack.

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/pify?keyword=rc+oscillator+circuit+pdf
    • http://nixodim.preetigujral.com/uploads/1/3/1/3/131380600/511751da5ed46f.pdf
    • http://files.supportacrafter.co.za/uploads/1/3/1/8/131856358/fenipised.pdf
    • http://files.blacksmithed.com/uploads/1/3/1/3/131384424/podabi.pdf
    • http://batariti.cameroncarpenterdesign.com/uploads/1/3/0/7/130740522/kuzonurumopiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/71569630937.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/bamulosumelewigiporejum.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4542/files/abstract_algebra_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/calculus_graphical_numerical_algebraic_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/comment_fusionner_des_fichiers_en_un_seul_fichier.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/64508828719.pdf
    • https://cdn.shopify.com/s/files/1/0450/6501/1352/files/exam_ref_az_103_microsoft_azure_administrator_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/9997/8904/files/varofinilulip.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/94607032813.pdf
    • https://cdn.shopify.com/s/files/1/0438/7835/1003/files/adquation_formation_emploi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/muwekanexujeredozimije.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_off000077f8.bin
30ae1637e7e12c6f18fe9f54c12ea1e31432a0bb23b9bf585d4d892710de0f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F8 5156 bytes
font_01_sfnt_off0000899b.bin
2d15b015542b7ed5cd05439eb16a7ad413189a7812921039b3a48113d4b01a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899B 10320 bytes

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