Malicious PDF — malware analysis report

Static analysis result for SHA-256 addf099b16ecad86…

MALICIOUS

PDF

48.7 KB Created: 2020-07-28 03:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29bb825388f10f78ce4103c0773b7021 SHA-1: 9e2d9ef0bf0c7848752579b8d7b503637183167c SHA-256: addf099b16ecad867bbdf63538dc6b545f25ae2d63a770ab0df4ba2b5de3783f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to `https://ttraff.cc/pify?keyword=best+android+tablet+walmart`. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector appears to be social engineering via a deceptive link.

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/pify?keyword=best+android+tablet+walmart
    • http://files.remembrancestars.com/uploads/1/3/0/7/130740462/95d49f5dd7.pdf
    • http://files.keyscientific.net/uploads/1/3/1/3/131384359/80e8de856ba.pdf
    • http://files.davidlouismarino.com/uploads/1/3/0/7/130776888/1aadff0167afc64.pdf
    • http://files.monkeysbnb.com/uploads/1/3/1/3/131398424/2272506.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/mibepokilidef.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/43524604543.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/giwisiviwapusiweg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5767/files/ludupazabetap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4943/4792/files/88051497189.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/wudino.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/rasudaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/8325886924.pdf
    • https://cdn.shopify.com/s/files/1/0432/6998/0320/files/wimiso.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/lanobekusux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/42672051100.pdf
    • https://cdn.shopify.com/s/files/1/0430/6177/2442/files/20612131888.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.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_off00008158.bin
ca3e3ca0e108d0f093193ecbf2e5a70163c4d00412210133f0132872660bccfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8158 5040 bytes
font_01_sfnt_off00009264.bin
59b108ead7cf4d10bdbe601a83bd0dc7d8b994b1d33c38f6b72a377ae1ffa1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9264 10180 bytes

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