Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49e1a8b6873cbf0…

MALICIOUS

PDF

51.1 KB Created: 2020-08-13 06:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62d8c7eb49ef7d434f93124f679ccc5 SHA-1: 65b89fb50e7f0202a0a56ba0239b93f7f0253a23 SHA-256: f49e1a8b6873cbf0c55785c37bcb268f28b7da1115a8acbe2658bfc7460f9181
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One embedded URL points to a known malicious redirector. The document body contains garbled text but includes the URL that triggered the malicious redirector heuristic, indicating a likely attempt to lure users to malicious content.

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/wb?keyword=behaviourism%20theory%20of%20language%20learning%20pdf
    • http://files.apexgki.com/uploads/1/3/1/4/131454719/f4d9d.pdf
    • http://kepefenet.escondidoeyedoctor.com/uploads/1/3/1/4/131407668/3373343.pdf
    • http://xediso.wrightrunningcoach.com/uploads/1/3/1/8/131858530/5fec795c9325.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/3_column_cash_book_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1003/8683/files/bakumepogivozulitewegubi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0219/0235/files/how_to_write_an_application_letter_for_college_admission.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/81227061568.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/ditopijozulezam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/dotabosuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/xanowudejavov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/66817991691.pdf
    • https://cdn.shopify.com/s/files/1/0434/7448/5400/files/72255775311.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/13135998197.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/62662385385.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/gevaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/5833677336.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2867/files/whirlpool_duet_washer_owners_manual.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_off0000891c.bin
cf288dd124840a32c9934e3e588354cdc55a39f7093e447d50430c3fcefb682c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891C 5668 bytes
font_01_sfnt_off00009c57.bin
04ec4d829638f1ac70c61343b7c56af594db2842aee6584927a9d126e462ceb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C57 10120 bytes

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