Malicious PDF — malware analysis report

Static analysis result for SHA-256 5851015b499140f3…

MALICIOUS

PDF

125.7 KB Created: 2020-09-12 05:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313b45f6c3fb9b042610194ab8c1236e SHA-1: 95dd832cc49fad305af541da86866b759eeed637 SHA-256: 5851015b499140f332e5dfd85e3875ee8ae8bcc24aadce62b7cbb2e2d14902cd
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector. The embedded URL 'https://ttraff.cc/wb?keyword=effective%20c++%20pdf%20free' is the primary indicator of malicious intent, likely serving as a lure for users searching for free C++ PDF resources. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wb?keyword=effective%20c++%20pdf%20free
    • https://static.usrfiles.com/ugd/b8c837_ed2611ed69e142f2a28598a3986cfe9d.pdf
    • https://static.usrfiles.com/ugd/5af86b_a3fec2a0263547879c431c31dd126845.pdf
    • https://static.usrfiles.com/ugd/02beb7_5061b5ce81724723ad3e957fdacbee2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_69fe03376c6847e08045daf54c459169.pdf
    • https://static.usrfiles.com/ugd/08fe48_9c325c0ee25245b9a2b09bdd3f194c05.pdf
    • https://static.usrfiles.com/ugd/d63aaf_45bf915cc31b421980cbcaab4dd354d1.pdf
    • https://static.usrfiles.com/ugd/b73feb_cba69e207bcb40fabf30af507a4f3f6f.pdf
    • https://static.usrfiles.com/ugd/e78b77_2dbc44de86aa401280eac20067a1b10a.pdf
    • https://static.usrfiles.com/ugd/3b0c81_69420c9b84f247439658da7f8cbe9861.pdf
    • https://static.usrfiles.com/ugd/b50c55_c59631ec98e945e2ba176bab8363e698.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_8147a0909a264acaa35139d8f933927f.pdf
    • https://static.usrfiles.com/ugd/fb5067_e7b0f21437d34457ac68d8a8f63039b3.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/82870848380.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/74401145152.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/42458329123.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/zavexopizukabalexe.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_off000199f5.bin
082c89522e4251f0a814862fddf633b1dac669eb780a02580130c1f52bfffe84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x199F5 3312 bytes
font_01_sfnt_off0001a5d6.bin
8ee2c7313177beab4c6c992d066151589683b1b6f2e655eefd53c8109127a596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D6 4748 bytes
font_02_sfnt_off0001b61d.bin
cc64a266354247f7bd7024ee6572cc7d64de59a1de8f94adc0eb87c20fa829b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B61D 16388 bytes

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