Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3757549da630c1…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 21:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99213a205feacf24833df16260d24cf0 SHA-1: 88ffd6884e2f99aad3a7aa8562dd84c3f8b0e08e SHA-256: 6a3757549da630c194aebd47d5cbcde005d5e3175ba9ef342ddee384ad034bf7
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 Shopify domains hosting other PDFs, forming a link farm. One of these links, https://ttraff.cc/wix?keyword=set+working+directory+in+python, is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly indicate 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.cc/wix?keyword=set+working+directory+in+python
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8085/1362/files/vanafisetopuxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/free_home_evacuation_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/3110/8504/files/86537672080.pdf
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/defuzokujikugaxujovujin.pdf
    • https://cdn.shopify.com/s/files/1/0428/8335/0687/files/casio_scientific_calculator_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0429/0373/2387/files/91733294280.pdf
    • https://cdn.shopify.com/s/files/1/0450/3319/3622/files/97041461717.pdf
    • https://static.usrfiles.com/ugd/b8c837_c59f01c313944bd89b6c6d5c60b9c983.pdf
    • https://static.usrfiles.com/ugd/6df952_b7b95efa8f954f09ac6e95f64bf3e8e7.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/11137690036.pdf
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/4467697217.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e2.bin
f031200ce7e335b600baeefc332639bc50afaf10564d0bd44ec8e6e0259f222a
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E2 5276 bytes
font_01_sfnt_off000078e4.bin
1d1c4b742a650607a28722d34945eadc6d9cd0d3da09d50a0c9556c04f3f9afd
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E4 10028 bytes