Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a306e14e49fc90d…

MALICIOUS

PDF

42.0 KB Created: 2020-09-06 00:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2b285acdece8a245691756f2c9bf018 SHA-1: e63c0df92bafa8a2b065435d56efd594dc7e6f5f SHA-256: 8a306e14e49fc90d6c2a696bc74ba0bf4579f6d9eb705ee4823f5addebb78329
154 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded URLs, forming a link farm, with one URL identified as a known malicious redirector. The document body is heavily obfuscated but contains the malicious URL, suggesting a lure to external content. No scripts were extracted, and the primary malicious activity appears to be the redirection 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.club/wix?keyword=pengertian+avertebrata+air+pdf
    • https://static.usrfiles.com/ugd/b8c837_632b364a7a88422b98969ff5ccf9022e.pdf
    • https://static.usrfiles.com/ugd/1decf9_c3d0fb7bf3f54568ae58c14ec60c275b.pdf
    • https://static.usrfiles.com/ugd/4d6844_f7ddab0ffb2a4e858d293e9d1b457fff.pdf
    • https://static.usrfiles.com/ugd/7a13df_a541bbed71d847ff9b9abbd444b81691.pdf
    • https://static.usrfiles.com/ugd/50988c_a633367ece5942acbc58948de62f0863.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/vemanigotijezaridil.pdf
    • https://static.usrfiles.com/ugd/271e65_fb2d3b3da1a742f587a8ab73c58f4de1.pdf
    • https://static.usrfiles.com/ugd/857e61_283cf6dbb0584ca4ba4fe7b46083082b.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_31a46de2d62d4ead9c32151756e0d7b7.pdf
    • https://static.usrfiles.com/ugd/68ec51_faf1050dcbda4237bbf7e0a0df11f896.pdf
    • https://static.usrfiles.com/ugd/1be480_6b0ac6d456f546139f24fbdaef4f0bc8.pdf
    • https://static.usrfiles.com/ugd/b8c837_de82ef8dd8774e5a86d629f3711181a5.pdf
    • https://static.usrfiles.com/ugd/8a05ec_4207c11858de4e3aa4a50ff28fb51653.pdf
    • https://static.usrfiles.com/ugd/735424_516bf487732943cb9341b385324fade4.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_off000067aa.bin
ff5b89e7a24105e3c4cfb9490b710ef0197eba1d0036053b8838ca27e1c3eea1
pdf-font-stream PDF embedded font (sfnt) at offset 0x67AA 5200 bytes
font_01_sfnt_off0000796f.bin
f26c33b2c6adf6de00cc6e50852e38532d8e357ad4fe5ae7869e391543e4321c
pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 9900 bytes