Malicious PDF — malware analysis report

Static analysis result for SHA-256 480b1598246dd6b9…

MALICIOUS

PDF

58.4 KB Created: 2020-07-31 18:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331d521f791c64ef440066441dfae2d6 SHA-1: 4da1ae4bd020b068bf23780b40d327d0b30f6d0d SHA-256: 480b1598246dd6b9fc21c354a41c3dea893ed4c265d07f0a2594aa1da4bdcdf2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a malicious URL, disguised as a UCSC eduroam login page. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely social engineering via a malicious link embedded within the document.

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=ucsc+eduroam+login
    • http://files.bankerchiropractic.com/uploads/1/3/2/7/132740905/bobosixejuvumifis.pdf
    • http://files.bottomfeedersthemovie.com/uploads/1/3/0/7/130775714/wexuwotojabam.pdf
    • http://files.wherechangeiscertain.org/uploads/1/3/1/3/131383424/53615a305f1964.pdf
    • http://files.dj-reaper.com/uploads/1/3/0/8/130813979/2608005.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/85943448147.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/tezonuzorijimuludur.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7333/files/rogodejifusokisiram.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4344/files/jidosolugemitozukurodude.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/doludaxapifesekike.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/0998/files/vafawulogageli.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/pavixemirivorebedo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/sedetifowakesefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/fekivorujevojadeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/78013262646.pdf
    • https://cdn.shopify.com/s/files/1/0438/1209/4109/files/60498321305.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/mivulikaruve.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009afe.bin
1b1bfa6c682e6b50f01c944abfd47ab94b58c0b3a7c2328b131821a0fc67353a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFE 5052 bytes
font_01_sfnt_off0000abfe.bin
bb038f57ca0f455559e71a90a6870dad8c1ffb505e3c9a3c83204ecd7b61b7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABFE 9956 bytes
font_02_sfnt_off0000ce20.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 4324 bytes

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