Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de4f44d435ee2ae…

MALICIOUS

PDF

43.1 KB Created: 2020-09-01 20:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc70bb09cea80b58e170848e43ec5072 SHA-1: a0c00c279ee52cd46e3b7e8f613bcba6d8e14c5c SHA-256: 3de4f44d435ee2aed6b7be75d7b33ee6715834d88d1597259aaab521257efb66
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.ru/pify?keyword=bd+jsc+result+2018+with+marksheet, is flagged as a known malicious redirector. The presence of this redirector suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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=bd+jsc+result+2018+with+marksheet
    • https://static.usrfiles.com/ugd/b8c837_a52dcec19ad449e08cce8e75e85e1561.pdf
    • https://static.usrfiles.com/ugd/67e251_4e3ae932c36242d4bc07374de0fea348.pdf
    • https://static.usrfiles.com/ugd/b8c837_f488848918cd444ea40602ca62bbc208.pdf
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/93543352678.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8504/files/pifewibebobejazosixigok.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/beautiful_baby_pic_hd.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/gezadutakuwejofizi.pdf
    • https://static.usrfiles.com/ugd/ce14f3_d5d7bc47b1634256afa92983ba8b0330.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7abb618046a4f458bb58e871afd2125.pdf
    • https://static.usrfiles.com/ugd/6f7357_efbcf71a468d4ab99083ce6d3b7b7a4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f00786febb774dfcb39f79a1bc40f0bc.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_off000062b0.bin
631dca1fcfa4ebfef35cedecdc5e35f74e2dff8f353c4cacfd131c78359a9bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 5980 bytes
font_01_sfnt_off000076fc.bin
eaed2176b4fa21b8e11160422523ceab5ea13faa857c2e18f35d3d68587c0b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FC 12716 bytes

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