Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b1308b07f78193…

MALICIOUS

PDF

47.1 KB Created: 2020-08-19 08:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31262b6945b9f49f644fe588aababac1 SHA-1: d66301d1a2a8f16867d66c8be1e002abeee417a1 SHA-256: a6b1308b07f78193d5f7ff5fc3b9ea359becc85962ff3f874dce983603112bb9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation of a malicious redirector. The document body contains garbled text but also includes the target URL, reinforcing the attack pattern.

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=seek+compact+thermal+imaging+camera+for+android
    • http://sasib.fionaclarebeauty.com/uploads/1/3/1/4/131406676/3451344.pdf
    • http://gowew.purewhiteproductions.com/uploads/1/3/0/8/130814471/7dd09.pdf
    • http://koturip.herbshopcincy.com/uploads/1/3/1/3/131398140/kaxamesebirikak-piwupi.pdf
    • http://files.tminz.net/uploads/1/3/1/3/131383333/dutanimud-zasekuvaxiwopot-vejuzi-wagaguxajup.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/74984954533.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajafaliwufenosikem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/43744177905.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/80788880180.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0486/files/base64_decode_file_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/87175021475.pdf
    • https://cdn.shopify.com/s/files/1/0433/0828/6105/files/jofugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1794/files/pefuravofanolojebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejumilaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/adding_integers_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/2891/9973/files/authorship_of_the_book_of_daniel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3613/0983/files/guarantee_certificate_letter_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f1.bin
3ce4ab4ff0e567cb1622167ecfecd30731c5c0c717f0b1beb8f09a82ac1a6f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 5556 bytes
font_01_sfnt_off00007b9d.bin
488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9D 6148 bytes
font_02_sfnt_off00008b7d.bin
0901cbd3c430caa8436c4cf8aa6803230b33f8aef935a489b1f73ba50e5f69c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7D 10264 bytes

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