Malicious PDF — malware analysis report

Static analysis result for SHA-256 64001f2cd3f3f55d…

MALICIOUS

PDF

45.8 KB Created: 2020-09-08 05:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d14c0af61c2aadb1040563031acfc84 SHA-1: 374220b3c65e9c57a1c0c2d63454ef6975891b1a SHA-256: 64001f2cd3f3f55df8a47eb285b60a2be509331d4f6b1c37696436611c4cde87
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on Shopify and other domains, which is indicative of a link farm or SEO poisoning attack. One of the primary links directs to a known malicious redirector, suggesting the intent is to lead users to malicious content or phishing pages. 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.link/wix?keyword=feeling+good+about+yourself+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/simoxolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/rexasomenaluk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/learning_english_free_download.pdf
    • https://static.usrfiles.com/ugd/217d68_70a37e9860034bc1b6f26110b696520f.pdf
    • https://static.usrfiles.com/ugd/760a88_a98c0492a31e4f869baf177ed1f735ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_b79a4ddfceea4674a0209aaea407c7b6.pdf
    • https://static.usrfiles.com/ugd/3cb679_04ba0fb889094bff839154ea942cb2c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_15a4cccd73704f5798b33229dc70b888.pdf
    • https://static.usrfiles.com/ugd/2f7815_e9de586fe8b8433b9bf771e78cae7014.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_a9642c17513d4d839fa64547dd60b939.pdf
    • https://static.usrfiles.com/ugd/868401_4d58553b99f746458248b60a89b4fbf3.pdf
    • https://static.usrfiles.com/ugd/ee4d88_c5e5fefba2c241ffa439bc9d3c720a98.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666c.bin
048f040668e8c2a826ecc5d781f8c06eac43cb5979857dcc0d12f223e90f02a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 5404 bytes
font_01_sfnt_off000078d9.bin
3bfe288e9b1233151c1014f00cbf33b1abfe81b163d55d8367711d31ffb71461
pdf-font-stream PDF embedded font (sfnt) at offset 0x78D9 10352 bytes
font_02_sfnt_off00009c44.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C44 4324 bytes