Malicious PDF — malware analysis report

Static analysis result for SHA-256 7204d2f9ccb56c3a…

MALICIOUS

PDF

44.7 KB Created: 2020-07-20 05:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 765b25c5590370cf0e7ddda8bd322871 SHA-1: e77515eae6bfa9a6a146fde7cca293588422ba9f SHA-256: 7204d2f9ccb56c3aab540bb1ff4c4d1e16ea3b3f9530ced3f18f36e83049f440
154 Risk Score

Malware Insights

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

The PDF contains a link that directs to a known malicious redirector, disguised as a manual for a Husky air compressor. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a compromised site or phishing page.

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/wb?keyword=husky%20h1820f%20air%20compressor%20manual
    • http://files.markparadispolitics.com/uploads/1/3/0/9/130969993/nuvomejemesu.pdf
    • http://files.kenna-kitchen.com/uploads/1/3/2/6/132696155/siwojuridefe_ditalopu.pdf
    • http://files.purnamasalura.com/uploads/1/3/2/7/132740519/ketupelanozuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wimorop.files.wordpress.com/2020/07/58410362506.pdf
    • https://fesigol.files.wordpress.com/2020/07/37598531643.pdf
    • https://gozuwej.files.wordpress.com/2020/06/ravepedo.pdf
    • https://wifomijelob.files.wordpress.com/2020/07/65582976278.pdf
    • https://bolekadeva.files.wordpress.com/2020/07/lofedakudiwej.pdf
    • https://xawuwerix.files.wordpress.com/2020/07/74381543334.pdf
    • https://vomaxepe.files.wordpress.com/2020/07/dibibufisugefit.pdf
    • https://pitolutup.files.wordpress.com/2020/06/59140232607.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/fikojogi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/jojilafukufupugokuxasux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/pokitolen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/68457538959.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/62437879911.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_off00006f67.bin
6476250d607c741ba9668659e8ee45be41cd97c281b4bf143db0d22ec1b3057a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F67 5704 bytes
font_01_sfnt_off000082a1.bin
5ee1978cff671e4b1be93016abb8e91031dfc42cec682c7cf54cbd7d7f877b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 10216 bytes

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