Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab73f455577c3bcd…

MALICIOUS

PDF

40.2 KB Created: 2020-08-10 12:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a5432fba74b7a373732286d5448f4ae SHA-1: 63e09cecb86e2321e155db0f821171aad8429a99 SHA-256: ab73f455577c3bcd1947dc206382423995b591be4e5d61098064a3bf338476ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also contains a URL that points to a malicious redirector. This suggests the PDF is designed to lure users into clicking malicious links, likely for phishing or to download further malware. The ML classifier strongly supports the malicious verdict.

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=pdf+compressor+mac+download
    • http://toburolog.skycampgreenwich.org/uploads/1/3/1/8/131856185/kojizigoke.pdf
    • http://files.savingtherealragemonster.com/uploads/1/3/1/4/131437017/20260670df69.pdf
    • http://files.pastorvaleriepope.com/uploads/1/3/1/3/131379099/862c619042.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1121/files/91245508754.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/jezefixe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3791/files/65973646403.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/74657797055.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/mexalido.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/27834914344.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/85529479954.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/2957600104.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/dejupawugezekikag.pdf
    • https://cdn.shopify.com/s/files/1/0428/6867/0620/files/41846212976.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/busezarexix.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_off00006008.bin
57903c056e9b9ac98b911bc46571f7a58969b8598a8c1e32ab69de9bae41c858
pdf-font-stream PDF embedded font (sfnt) at offset 0x6008 5396 bytes
font_01_sfnt_off0000725a.bin
865460d1cf76d5d5ba5ab9f2123a392bdf7ac6322108e948085964d163c6c8a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x725A 9968 bytes