Malicious PDF — malware analysis report

Static analysis result for SHA-256 347b6ed00368f642…

MALICIOUS

PDF

42.5 KB Created: 2020-08-30 13:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f69387a81ce16188927a53012b17d69f SHA-1: 4205bd6f084d83cf32e47b2498eedc5fb35d9ecf SHA-256: 347b6ed00368f6424decd1a2e078afee616a4546bcba2c2edad81b101d4ada5a
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lead users to malicious content. The primary IOC is the redirector URL, which is likely used to obscure the final destination of the 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.club/wix?keyword=etapas+de+la+administracion+publica
    • https://static.usrfiles.com/ugd/b8c837_2b0c942838774af2964df5ff3177f97c.pdf
    • https://static.usrfiles.com/ugd/b8c837_712b200d63af4270b27f251c76599bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_72d799f7de07494d9d8d6d4f0dc5e40b.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_98d6ca50d64940e782482330fbe922af.pdf
    • https://static.usrfiles.com/ugd/f55bec_931bbf0a273f4da6923293a6fdbc759d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/27556742961.pdf
    • https://cdn.shopify.com/s/files/1/0454/2306/7304/files/kinenuzuxekarirexom.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/26182383781.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/vsepr_theory_shapes_of_molecules.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/venuganesiwefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/fafanefemowamabefevizotu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/59554496318.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/club_cadet_1042.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/us_visa_interview_questions_and_answers_f1.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/tepadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/arangetram_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0465/3980/0734/files/geometry_transformations_review_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/7879196247.pdf
    • https://cdn.shopify.com/s/files/1/0449/2414/1735/files/81871220181.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_off0000652f.bin
b90d46dbbc6a20a38a299968abe0d7c2e21231d166d274dfac46520ef918c060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652F 5316 bytes
font_01_sfnt_off00007717.bin
071052b4937242ececa9d4159487fa803a98cc7b1a74068688cb0ae3adc98cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7717 11128 bytes

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