Malicious PDF — malware analysis report

Static analysis result for SHA-256 1738bdc2e27b0de3…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 17:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b08d1a10cb4e6af9d5b1b14057349f SHA-1: 60a370be60cd88d31671e59c08ad4cb197a98dba SHA-256: 1738bdc2e27b0de31fe215f5a3f9e115d4dd7888ea86a7ce0a8a4a60848a53ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Sterling gun parts' and a URL that appears to be part of a link farm designed to drive traffic to potentially malicious content. The presence of a malicious redirector and a large number of external links suggests an attempt to lead users to harmful websites.

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.com/wix?keyword=sterling+gun+parts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/83b1b3_3df16417ea8244f19294d1efa76a6057.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a8e8b88ce3f42ecaa4fc7149577fd9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f8358369e3c4c76b7e1d3a4c201b95e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7635e6b6ccf54de48dbbe95742ce41b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_59314993d6cc4bf49b3ec87b9c1fab23.pdf
    • https://static.usrfiles.com/ugd/b8c837_79205009721042c7a088d05b4efaf80a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1eeb1d42e4af45868d3c1e9680d850aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d111c0e31f545549e6df551deddc367.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2e180409194f98bff96c534e57243b.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3715/files/present_past_future_continuous_tense_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/95386715501.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/24571619732.pdf
    • https://cdn.shopify.com/s/files/1/0449/8427/1016/files/86542255394.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/soxedetigazejilowod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kebiwubinixakagaxirefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/gedix.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_off0000669e.bin
1a3722775466a80c3265bcd392218f3c652e52062098481285eae097c6078110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669E 5092 bytes
font_01_sfnt_off000077f7.bin
69dc8642ea8ce100146613584754a1084e0476e0753f81c045ede91375120859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F7 15484 bytes

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