Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf319657a7062b2…

MALICIOUS

PDF

44.3 KB Created: 2020-07-27 20:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f77cf27e1bac59c12ad773c1b84d116 SHA-1: 23ebd866b8a05b0c61dd9c62677dc0ef9faff5a4 SHA-256: 0cf319657a7062b2f0c6fd0eaef4f296b52838e84ddc92b2e2e2c35b77cc449c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=balance+sheet+account+assertions`. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which points to `https://cdn.shopify.com/s/files/1/0439/5443/8302/files/tobowevojojeraxi.pdf`. The document body, though heavily obfuscated, contains text related to financial assertions, suggesting a lure for phishing or further malicious activity.

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=balance+sheet+account+assertions
    • http://files.thelmavelez.com/uploads/1/3/1/1/131164210/vifufomodopa-kuravanakupiwe-nanud-mibejesepe.pdf
    • http://files.crazyabtcupcakessd.com/uploads/1/3/1/4/131437680/e23efcef1.pdf
    • http://files.yellowbowlproject.com/uploads/1/3/0/9/130969075/289861.pdf
    • http://files.jeffellwood.net/uploads/1/3/1/3/131380469/rakoket.pdf
    • http://files.doublertack.com/uploads/1/3/2/6/132681464/zenadonir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/tobowevojojeraxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/pilig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/51057407461.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3279/files/kawavewizeper.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9089/files/15790225129.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/sinapusemukikibaninu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5512/7459/files/jemujovudawevep.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/90483191501.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/kugopejigozaxepexonurapi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/9982708091.pdf
    • https://cdn.shopify.com/s/files/1/0437/0215/7466/files/76483479860.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/pesovonow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/rudulojud.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007197.bin
9ca7630988c330793a3d57a8800e5dea99549484e596523974b64f4c579204eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7197 4816 bytes
font_01_sfnt_off000081df.bin
f31928205512b43f1bea2c73c142fa978e92031f212d186392b9a7d1194d3e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DF 9864 bytes

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