Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42182130bb45d1a…

MALICIOUS

PDF

37.9 KB Created: 2020-08-03 01:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb9a932b4b1e01a16296f5cd181752e SHA-1: ce09944497fcd1e9c61812bbf5ff172e2c5bee8f SHA-256: f42182130bb45d1a00f7374093a80549b879d8fb66076f51b96ccc955f656d41
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), and another flagged a large external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and references to 'Dark souls 2 titanite shard', suggesting a lure to attract user interaction.

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.com/pify?keyword=dark+souls+2+titanite+shard
    • http://files.theplayfactoryplaygroup.com/uploads/1/3/2/6/132695813/vizakeper.pdf
    • http://files.marytolan.com/uploads/1/3/1/0/131071137/kejamuxiv-tafakuwuwibifo-jezadaraxixati-dumuzulisob.pdf
    • http://files.lighane.com/uploads/1/3/0/8/130813307/kapuwe.pdf
    • http://files.halovolleyball.com/uploads/1/3/1/4/131407045/f1481df.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33540287451.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/lusikojosa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1669/8530/files/92589738607.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/70620182364.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/paletewojukenoso.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/samumuvepulimopoledologon.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/jizebaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/8606/7352/files/36644593920.pdf
    • https://cdn.shopify.com/s/files/1/0439/7511/4910/files/88827345282.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/fusuwoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/98697495037.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/jidojaxezefopufekedonapig.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_off000055c4.bin
24f3fdca4aa802576a481609b7f6dcb18ce158b864307657201b648262a015ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C4 5108 bytes
font_01_sfnt_off00006723.bin
9744df42c09825e1b1d148bd9a41605d5d190cf19ba49fe149eb23b407521b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6723 10504 bytes

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