Malicious PDF — malware analysis report

Static analysis result for SHA-256 6813cb0de1f64898…

MALICIOUS

PDF

61.9 KB Created: 2020-08-21 04:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 068d14bb27a71638df00e796b4eaeb84 SHA-1: 686d1d4d3c665d0642743b55a5b53e3ae09ee910 SHA-256: 6813cb0de1f6489803c10ab2b07395dcb838bb342e7cbb1213087e942939db69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is ttraff.ru, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=momentum+in+two+dimensions+worksheet
    • http://files.kendravernon.net/uploads/1/3/0/7/130775958/lujakuwidufup.pdf
    • http://files.fincafantastica.biz/uploads/1/3/0/7/130739120/pawasasuxujewoxit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/92871381344.pdf
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/anemia_ferropenica_etiologia.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/neoclassical_poets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/sunken_treasure_wow_classic.pdf
    • https://cdn.shopify.com/s/files/1/0440/3773/4550/files/sijuposet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/musenadefizeduk.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/hot_dip_galvanized_steel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/high_school_to_college_resume_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/88580772911.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/subiwofixoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/ap_calculus_book_download.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_off0000a984.bin
01e48f1e33f663ff3906d88bc54286436333ecb31d73e9bdc480a0a99b088c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA984 4868 bytes
font_01_sfnt_off0000b9f4.bin
e3336999da3eac9ddf695e74d8fc9b86f5d06b3087c1f5e8b73510cfb2f6373a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F4 10140 bytes
font_02_sfnt_off0000dc91.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 4324 bytes

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