Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f4be0c8d681eb5…

MALICIOUS

PDF

111.5 KB Created: 2020-08-02 06:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a3c6a146d552d754736aa973305ad7 SHA-1: c004ab1139a718e048601700938043db47eb9518 SHA-256: 21f4be0c8d681eb5bab500276e595b2933c411b795668de631da9c9c85c8d042
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. Additionally, another critical heuristic detected a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The embedded URL points to a redirector that likely serves malicious content or leads to a phishing page.

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=coordinate+transformation+matrix
    • http://files.gaindetalks.com/uploads/1/3/0/8/130813755/rokufiwila_wefopiji_sepafatoduva_vusixenetepil.pdf
    • http://files.penandnapkin.org/uploads/1/3/1/8/131857305/futabufizinivobame.pdf
    • http://files.thomfogartypresents.com/uploads/1/3/1/3/131382673/a41f75a030.pdf
    • http://files.pycap.ca/uploads/1/3/2/7/132710782/labupivos_vesagidoriro.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/19487323028.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/83285832360.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/80049420007.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/80862601201.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/guditisazefoxamamud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/xesijiserepajevugujejami.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/21837824726.pdf
    • https://cdn.shopify.com/s/files/1/0437/6290/9335/files/30177022421.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/davadeliwu.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/unity_lookat_2d.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7832/files/39835425451.pdf
    • https://cdn.shopify.com/s/files/1/0430/0380/5847/files/duxukolutuxumero.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutuxajaz.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_off000151c8.bin
4b905227272cd39a3e23f2fcb57f1c1ba4e6adb7e302e497b257fc521b4737f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151C8 4996 bytes
font_01_sfnt_off000162ad.bin
d794b90e957c4e21cc9da4c72ddc2d1791bc29441c9a12f59b60507ec84b23e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162AD 16540 bytes
font_02_sfnt_off00019690.bin
9a423c16be5bdd5f0d4d749fcf0b84e41bab6202433aeae789ffb081933c7709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19690 17356 bytes

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