Malicious PDF — malware analysis report

Static analysis result for SHA-256 59172eb936f30cda…

MALICIOUS

PDF

37.2 KB Created: 2020-08-19 21:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ae0f65f7eaab6aa228ea4a5ee636fcb SHA-1: b08bea3f52d805eeb6846f4b222e754dddef0511 SHA-256: 59172eb936f30cda546dcf7623aa3c78cb2a42c80f56593160fc470cd8c2e6be
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, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Sheet street bed lamps' and the malicious URL, suggesting a lure to a phishing or scam page. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=sheet+street+bed+lamps
    • http://files.keya-tshirt.com/uploads/1/3/1/0/131070379/mudiseminadataduvig.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/weladaxowule.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/83753902428.pdf
    • https://cdn.shopify.com/s/files/1/0440/6624/2710/files/40422813413.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/32772959773.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/hvac_systems_design_handbook_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/64323874200.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/wobofozulimomisodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/nofipodiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/85913529229.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9600/files/99374799591.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000549e.bin
803f426df1e89ee81d28843b002920c0080c4d24f4b0c90bc44646c08c899a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549E 5440 bytes
font_01_sfnt_off000066f0.bin
467489aeec9b2638cfd60a541582f48964d0f319888287a97a66dcb2635f8f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F0 9824 bytes

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