Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb620b7e42ca12e…

MALICIOUS

PDF

36.9 KB Created: 2020-08-21 20:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e79a4d72203f07cdb78ec773e0a472 SHA-1: 665c384f8cd54c037455f5ce92452ed0690c9f31 SHA-256: 3cb620b7e42ca12e20676d9b5c5e56accbc921e73e46d5c7f926418dcb7caf74
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lure users to harmful sites, potentially for phishing or malware distribution.

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=backyard+baseball+09+pc
    • http://fusigebu.ccstudioinc.com/uploads/1/3/1/8/131857334/511eaaa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/0998/files/7219836754.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/koxug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/baaghi_2_movie_video_song_videoming.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/d_d_5e_dm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/65505790810.pdf
    • https://cdn.shopify.com/s/files/1/0436/2508/7138/files/labview_scada_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/42407927477.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/53145945427.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5073/files/cystic_fibrosis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/16827946275.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_off00004dd7.bin
b295f38db616a57d4d1dc73e71d1f6229f37776adcb9559fdb422804ffdcbdfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD7 5720 bytes
font_01_sfnt_off00006162.bin
24246d8de3bc20e8b32324011fc8e62b2b64b8389084541067e8a0d6fd38757e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6162 10592 bytes