Malicious PDF — malware analysis report

Static analysis result for SHA-256 768e5ba9c6b71429…

MALICIOUS

PDF

32.7 KB Created: 2020-08-31 13:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 817000fb21ab91645c111f24fa17f758 SHA-1: 1f424a552e72aa66e6db3d48844b51933bb355ac SHA-256: 768e5ba9c6b714293fc9ee4160c736fbab5cffecad04c1a63800dceeb5408a3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious URL, disguised as a "pen and ink drawing guide pdf download". The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this malicious redirector. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, but the embedded link is the primary indicator of malicious intent.

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/wix?keyword=pen+and+ink+drawing+a+simple+guide+pdf+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7c3584_6ef5ed33e31b4da08025e0404dfc8726.pdf
    • https://static.usrfiles.com/ugd/52b593_862340ed77ca41a1a28761dfcd067ac4.pdf
    • https://static.usrfiles.com/ugd/a91264_98a1dd13abf349d38887804dd4d0772b.pdf
    • https://static.usrfiles.com/ugd/b8c837_99708c189bd14f61846832929278c864.pdf
    • https://static.usrfiles.com/ugd/98e298_24d3ee9e4628495b838af1501508026e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6be614b22c3548e18788740c7ce0d049.pdf
    • https://static.usrfiles.com/ugd/8ba634_9108e023a3f543aca00cf5273a412f12.pdf
    • https://static.usrfiles.com/ugd/4725f1_8a5932a903a54bc389eeac2b1f783ba2.pdf
    • https://static.usrfiles.com/ugd/3b7182_c6dd0f963470421dbcc1f021ccd947b9.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/15011879443.pdf
    • https://cdn.shopify.com/s/files/1/0465/1266/8830/files/everwing_unlimited_trophies.pdf
    • https://cdn.shopify.com/s/files/1/0464/6885/8024/files/dokipufogum.pdf
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/3994402325.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042eb.bin
88b82ba631bbcda43b11c415d7fc90dc9ab67ddef17af47785dbf2a1b8ec6c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x42EB 5516 bytes
font_01_sfnt_off000055b1.bin
adf7312122c11219d9418d0eb9d165f61856e60e5c229e40c31b6b4a62f8206b
pdf-font-stream PDF embedded font (sfnt) at offset 0x55B1 9512 bytes