Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9951bf2313f573…

MALICIOUS

PDF

40.7 KB Created: 2020-07-31 06:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e556955236dbce8e44e8ece2f88d4c SHA-1: 258e36cbdffe769bbdbed82a6b0a5f282ff5581d SHA-256: bc9951bf2313f573697b0645e462eefec617f25b8659a2212a6296fe6d02725b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on domains like 'cdn.shopify.com' and various other file-hosting sites. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

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=algorithme+exercice+et+corrig%25C3%25A9+pdf
    • http://files.harveyjettmusic.com/uploads/1/3/1/3/131384401/fb78fc6a690c69.pdf
    • http://files.nsportsreccenter.com/uploads/1/3/0/9/130969897/jurasif_virumojof_senufaka.pdf
    • http://files.nelsonmandelachildrensfund.com/uploads/1/3/1/6/131606953/tovujisatuni.pdf
    • http://files.acceleratedancearts.com/uploads/1/3/1/3/131382092/490268.pdf
    • http://files.jkxtremehardscaping.com/uploads/1/3/1/0/131071137/nexizobofabis.pdf
    • https://cdn.shopify.com/s/files/1/0429/0514/1411/files/sobavunugor.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/piwizipomutilobezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/54358721864.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/49574435337.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/xemivubegip.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6421/files/32789015547.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/denumed.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/bufevetelatozagiguroxet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/68278213618.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/34835862013.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9402/files/xewisafemotewomazuxo.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/
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/54358721864.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8c.bin
49e23115b4ebb8c69fd0d4e0d2fd1b35e82e44047eafce1a4ce581af72c28195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 5064 bytes
font_01_sfnt_off00007087.bin
22eb8e688879d3d9a6ae0cfef6bbdb1d33583e9e8816cf04375f4cb1d786f808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7087 11116 bytes

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