Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd7bba2e7fd9506…

MALICIOUS

PDF

36.6 KB Created: 2020-08-31 04:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e5607bb03f9e7dc96f6fdafefb2600 SHA-1: 416bf4d47aa27c73df7299686b3e3b5755d4d4e0 SHA-256: 9cd7bba2e7fd9506a3c53b69a1c6cf0342a078729aed76d01a20b85ae1011329
152 Risk Score

Malware Insights

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

The PDF contains a "spot the difference game" lure and embeds multiple links, including a critical redirector link to ttraff.ru. This suggests a phishing or scam attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and link farm behavior.

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/wix?keyword=spot+the+difference+game
    • https://cdn.shopify.com/s/files/1/0462/6995/6245/files/81550058849.pdf
    • https://cdn.shopify.com/s/files/1/0436/2049/9620/files/wibikuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/xoxosogifapuxajupari.pdf
    • https://cdn.shopify.com/s/files/1/0437/9426/8320/files/57119649327.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/world_countries_and_capitals_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/mebalesewub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/12367119578.pdf
    • https://cdn.shopify.com/s/files/1/0438/5194/0000/files/rab_microlight_alpine_jacket_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5384/files/57282706735.pdf
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/53124973334.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/piman.pdf
    • https://static.usrfiles.com/ugd/bf650e_384c8ae8a12548a4825c726324d32304.pdf
    • https://static.usrfiles.com/ugd/9c3693_6dc7788071a244ceb13f5fd2393f914c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005024.bin
2edf04a97271d2e7a7558af3329d797c5b94905af201cf0973cd68b43b1b636d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5024 5460 bytes
font_01_sfnt_off0000628c.bin
cfc816cd10a3633564b15eae78593efb2420b7f6791724ffb466b50a8aca3d9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 10380 bytes