Malicious PDF — malware analysis report

Static analysis result for SHA-256 0070edb42d360f64…

MALICIOUS

PDF

89.6 KB Created: 2020-07-28 19:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3b3265da7cb24eaa9b015de8afd9bd1 SHA-1: c93e374515161673446dd68c0d4e8dc673278823 SHA-256: 0070edb42d360f64c4170c00985acf33a903d5bcf874f2b3fd73fbaaa52dd6bb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a deeper analysis of its specific lure.

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.ru/pify?keyword=brimham+rocks+climbing+guide
    • http://files.thewingedhorse.org/uploads/1/3/1/4/131454316/1314489.pdf
    • http://files.jennabradshaw.com/uploads/1/3/0/8/130814050/xufiluxe_rorunatexaket_kemozulamapevus_sozebevobamobab.pdf
    • http://files.sproutlanguagesolutions.com/uploads/1/3/1/6/131637853/9a9c4c7982ee21e.pdf
    • http://files.thefinishdepot.com/uploads/1/3/1/3/131383478/dofedij_todonubibupelot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5520/8858/files/63490661001.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/52805267582.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8720/files/18706828492.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/xunoje.pdf
    • https://cdn.shopify.com/s/files/1/0431/1040/0153/files/xetabewotevuponu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/65949870098.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/27905444774.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/13631879837.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/titajolutigisupuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/3652801201.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/8564533533.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3914/files/19577953612.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/jazewebor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/bevepovudejumukar.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_off0001232e.bin
d910378e2e072b530f9839010d96115a2e1765ffe117ff2cb664732ffb634a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 5408 bytes
font_01_sfnt_off0001354b.bin
09eb1dfc7695b46308a61717c2ccb8083d02d346fa907377781a2fc5b7397433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 10512 bytes

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