Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8167e2b08412260…

MALICIOUS

PDF

59.6 KB Created: 2020-08-01 14:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e493b6cd7515fa9fe6d91bf1030b1888 SHA-1: 98d1f8beca3afaa9d609d4b906be4f8ff9c28b55 SHA-256: c8167e2b08412260e432160afb49a13fc77acd694724448006803993cf241bc0
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.cc/pify?keyword=blocked+matrix+multiplication`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. 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=blocked+matrix+multiplication
    • http://files.sandislandtennis.com/uploads/1/3/1/3/131398036/7488448.pdf
    • http://files.msmsblog.com/uploads/1/3/0/7/130739895/5414156.pdf
    • http://files.jmoymi.com/uploads/1/3/0/7/130739059/97713fa3d6433.pdf
    • http://files.whispersofthedarkmoon.net/uploads/1/3/1/4/131411539/kojura.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/wuletegajiduso.pdf
    • https://cdn.shopify.com/s/files/1/0435/2950/2874/files/jutedagegoladibusoxuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/70549838672.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8506/files/12286756079.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3603/files/lecrae_tell_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1285/files/xoxeja.pdf
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/97976436349.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0440/2819/9062/files/julemafufizazisi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/24126209304.pdf
    • https://cdn.shopify.com/s/files/1/0435/7498/4863/files/nomodoxitog.pdf
    • https://cdn.shopify.com/s/files/1/0437/3879/2085/files/content_type.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.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_off0000880f.bin
81cad990b0d1e4fd09c5f5a4f4a58769cb429abfa092e2a0ceb5feff6322910c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880F 5220 bytes
font_01_sfnt_off000099ba.bin
648e5a29a46b06ae6615c9bc01ed10b95cc5faa3dbbeb1e2aadda19da1400ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BA 15696 bytes
font_02_sfnt_off0000cad5.bin
81414644a2b04da35792b5ed096d60653fb9978e29cf8e765c557d33b2308b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16556 bytes

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