Malicious PDF — malware analysis report

Static analysis result for SHA-256 15af432fc377bf87…

MALICIOUS

PDF

38.3 KB Created: 2020-08-25 13:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a06fe2bb962adb05714e613da8c27987 SHA-1: c3a0951fe2419bb2270b37482942c8378c8ab317 SHA-256: 15af432fc377bf873b7d918f06517ebf8d36f7702cdd52f0342f071726606532
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, including a known malicious redirector at https://ttraff.ru/pify?keyword=cfl+stats+pdf. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to drive traffic to potentially harmful sites. The document body is heavily obfuscated and appears to contain junk data, further supporting a malicious intent.

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/pify?keyword=cfl+stats+pdf
    • http://files.wordsmithphoto.com/uploads/1/3/1/4/131437689/sebowawixaxalodar.pdf
    • http://nezakebek.emeraldandvioletstudio.com/uploads/1/3/2/3/132302978/weveronadezoma-dajolulupuf-pesojon.pdf
    • http://jexiwi.penderharbourcommunity.club/uploads/1/3/1/4/131483598/6328748.pdf
    • http://files.lithgowagedcareltd.com/uploads/1/3/0/7/130776033/nawag-xalaxixavixilas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/10282338143.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/3386392971.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/chemistry_journal_abbreviation_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0315/files/answer_happy_birthday_message.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/sanitary_napkin_vending_machine.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6314/files/98145071735.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/technical_analysis_in_the_foreign_exchange_market.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/69086308732.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/16860179662.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049d6.bin
e2294488f606b425e534683049c2e992a6c2d63f30c08476fa5200840398a077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49D6 4368 bytes
font_01_sfnt_off000058b4.bin
6f7fdbe3eb9c1dda92e7858c94003e938986372517838593a95403a96dea650a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B4 11964 bytes
font_02_sfnt_off00007eb0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB0 4324 bytes

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