Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e26175daee4c4d…

MALICIOUS

PDF

44.2 KB Created: 2020-08-19 03:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c919d8b08af9d2dbe07d60a0f68e09 SHA-1: 20eee9f499bb16ac4256badc924f7f69a85893dc SHA-256: 91e26175daee4c4d995f4250912af34c71d3c4b1904b4dfba0161d3eca8583bf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link farm and a critical redirector link pointing to a malicious URL. The document body, though partially corrupted, contains the same malicious URL and references a video game guide, suggesting a lure. The ML classifier also flagged this PDF with high confidence. The primary attack vector appears to be a phishing attempt using 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=fire+emblem+three+houses+edelgard+route+guide
    • http://baxukat.jennyframe.com/uploads/1/3/1/4/131438474/lunokekepemij.pdf
    • http://files.rowanlestat.com/uploads/1/3/1/6/131636941/razopanelofidi.pdf
    • http://files.yellowroseevents.co/uploads/1/3/1/4/131409508/4771905.pdf
    • http://kikopo.fsumarinemegafauna.com/uploads/1/3/0/7/130739061/0235b4cd2fcdc.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/65334259712.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/operations_manual_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0072/files/beginning_sounds_worksheets_for_first_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/luis_de_camoes_lusiadas.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/rupuresimivusi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7061/0851/files/tonufudefapilodob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruketisoren.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/77108191234.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/setukalopaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/mukotedukivusedenojedi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9020/5090/files/rufizapemonesafetok.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_off000063af.bin
e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AF 2952 bytes
font_01_sfnt_off00006e3d.bin
c065d99ae70f7a9a858aff22e3d51f32838dd77016f5d9437f42d6cc87460cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 5332 bytes
font_02_sfnt_off0000802b.bin
45ab78cacc53815039de2b53b62948123cee8f6c304ae6d08fabbd8336b6e87c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802B 10308 bytes

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