Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88b5843853570ec…

MALICIOUS

PDF

45.3 KB Created: 2020-09-01 02:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e057582110561aae9c0f2107b168dfb SHA-1: a2b555037781cfddf0583b73292bfa22ce5c95f8 SHA-256: c88b5843853570eca248be30b0e37826fc1477a672cf28b8d526a555ad11eb18
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'business event invitation templates free' and a URL that matches the malicious redirector. This suggests the document is designed to trick users into clicking the link, leading them to malicious infrastructure.

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=business+event+invitation+templates+free
    • https://static.usrfiles.com/ugd/0cd3a8_75478a8fd36c43d3b0c0b88cc9875f8c.pdf
    • https://static.usrfiles.com/ugd/dd4472_f0350563aa284b9eb91dc916b3424298.pdf
    • https://static.usrfiles.com/ugd/b8c837_a38d6fa4cb47484080ed3b800154c22e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bec7f00dfa645c18488ffa75b96729d.pdf
    • https://static.usrfiles.com/ugd/111c46_bd31458e100d4b38ad4bf2ce67dedc36.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_9e1680d6492e4adda3cf08495eded2bc.pdf
    • https://static.usrfiles.com/ugd/74e905_c80c63e623464cdfa9cdddd8b209c8ab.pdf
    • https://static.usrfiles.com/ugd/eda9ba_82a48c62d83d4affbcd921553b66b117.pdf
    • https://static.usrfiles.com/ugd/ab922d_2eaae2012c094d60ad1b3adbeb8f6dbe.pdf
    • https://static.usrfiles.com/ugd/6c032c_1e55c292292a441082b40ccaf338702c.pdf
    • https://static.usrfiles.com/ugd/fa6f14_b1edcd630f1e47c1b070d467c75cf664.pdf
    • https://static.usrfiles.com/ugd/ba3095_c6b23f1863f14f80bd206de44b32fb85.pdf
    • https://static.usrfiles.com/ugd/a298ce_90ded67b1ed44c4aa246b4496bf86407.pdf
    • https://static.usrfiles.com/ugd/b8c837_557249ec494e4881a9f2d85c22145eb4.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_off00007451.bin
a3ad78d485affc434aff3e4b34c14a5d8f60b0ea323bd52f0b6bd66151ca817b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7451 5156 bytes
font_01_sfnt_off000085cf.bin
1fe888bd520f401821c7cc928800010e01035dc7b605fc133e6adb2e9d925203
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CF 10132 bytes