Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e0d25aa9dc1536…

MALICIOUS

PDF

39.3 KB Created: 2020-08-17 01:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b4ea87d806df52e225e19104af5f4a SHA-1: 750ba065d2b4af3b66e0a12487369b5104d9d40b SHA-256: 91e0d25aa9dc1536cb754a942041d35ac362f7f781793c6170b74249ab25e12a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=payment+integration+google+forms'. This indicates the document's primary purpose is to redirect the user to a potentially harmful website. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=payment+integration+google+forms
    • http://zunusadid.strengthforthejourneyretreats.com/uploads/1/3/0/8/130814011/wafuda_xazesimovise_wulobazupe.pdf
    • http://files.t4tenglish.com/uploads/1/3/1/6/131636612/gubujixipev.pdf
    • https://cdn.shopify.com/s/files/1/0450/9057/0405/files/metode_ceramah_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/object_oriented_design_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/95570698178.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/58652806479.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/delam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/convert_entire_website_to_mac.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/cardiotocography_interpretation_nice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/40623733854.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_off00004ff8.bin
97cb350a2997fa54b32e8fe6d6daa42505b708946d6debe98e866714721726f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF8 4980 bytes
font_01_sfnt_off000060ca.bin
3396c4fb22bfc65ec227380929218b2843f0515abc42f2d933bf4480e6753544
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 9908 bytes
font_02_sfnt_off0000828d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x828D 4324 bytes