Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f372044689d8d7…

MALICIOUS

PDF

52.4 KB Created: 2020-08-30 02:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a2882af5dba866f2919587c3089b9e SHA-1: ab4a099a2aa1b6743c909cbb22bfe342e6c55838 SHA-256: 46f372044689d8d71045c4535f3880ffbfe995bab154b7c8c8fa52b0d659f24b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm infrastructure at 'ttraff.ru'. This heuristic, combined with the ML classifier's high confidence, indicates the document is designed to redirect users to malicious sites. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=integrated+density+imagej
    • https://static.usrfiles.com/ugd/b98abb_fcd1e82382b1412884e029b21452a232.pdf
    • https://static.usrfiles.com/ugd/bfbc46_21425d189c504345aa7c8b74a9833c4f.pdf
    • https://static.usrfiles.com/ugd/8b2c09_6620014c0b8b4bccb142a710099c1e55.pdf
    • https://static.usrfiles.com/ugd/b8c837_c925f738a49d44788c5f180e92f1ebea.pdf
    • https://static.usrfiles.com/ugd/b8c837_42c352870c6d464aa2ba5c4fa26692ff.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/18577641219.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/maps_live_traffic_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/70668863987.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/bezida.pdf
    • https://cdn.shopify.com/s/files/1/0434/4152/0805/files/36765363182.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/65202118257.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/juvesixedineteraka.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c67f7cb46ec4db4bb313ee2c5d72f4c.pdf
    • https://static.usrfiles.com/ugd/a382ee_ca5089fdb2344d85b369d13815fedac4.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c61.bin
dd741bede4a13428e89e4642489a90d3d85b54c575cc4c24905babbacd102c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C61 4904 bytes
font_01_sfnt_off00007cee.bin
a654103d1f555058db278fffebb637def2b7f483533c08f2f428b41340ba0a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEE 10616 bytes
font_02_sfnt_off0000a15e.bin
12198ed304d8e74df64bcaa8a4aae6da6436d73ceeb6d758e01031f89a18fcfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA15E 16076 bytes
font_03_sfnt_off0000b608.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 4324 bytes

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