Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b5a39b677d62a1…

MALICIOUS

PDF

52.6 KB Created: 2020-07-21 10:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9bb47cc7bdf59f22aa358b554fd2863 SHA-1: 14256ec6ea803b4a91c102bd9e1f8ffa61dd7774 SHA-256: 37b5a39b677d62a10b26ddc3c1d2a2219c44ccba5880a91e0e33bd192911bedb
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.cc'. Another critical heuristic identified a PDF link farm, with the initial URL pointing to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily garbled, contains text related to 'Orçamento empresarial' and 'wkhtmltopdf', suggesting a lure document.

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/wb?keyword=or%C3%A7amento%20empresarial%20aprender%20fazendo%20pdf
    • http://files.flintrockfarm.com/uploads/1/3/1/1/131164205/8286916.pdf
    • http://files.instinctemporium.com/uploads/1/3/0/9/130969211/kelopofidegubu.pdf
    • http://files.walthamforestwomeninbusiness.com/uploads/1/3/1/4/131437953/momewunajosu_mosisasa_lizirowejoteji_feribitu.pdf
    • http://files.grumpypuppybarkery.com/uploads/1/3/2/3/132303163/sepolimezimuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demesudixagivok.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/bumojidaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/80026791796.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/67810317170.pdf
    • https://pewiwixida.files.wordpress.com/2020/07/77380379351.pdf
    • https://mobulozasa.files.wordpress.com/2020/07/17539615937.pdf
    • https://zexixomiwos.files.wordpress.com/2020/06/47562288605.pdf
    • https://bagikib.files.wordpress.com/2020/07/58778166610.pdf
    • https://mulovutizupi.files.wordpress.com/2020/07/kudimafuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/fikufefexonakedusoxosabor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/guwokeduvudewebosenuwet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/degidomimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/bilopebare.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/pirekivadaletexufusuvis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/kazakenel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/68222003308.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/paxukirumagig.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/betenazilidakititiluti.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_off00008b44.bin
81750996baa563a1239dd6c3b8206a1069fb52170c23a011d6cdae5ebdb6ffe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B44 5236 bytes
font_01_sfnt_off00009cf8.bin
a336edd028e468266cab8d5c903989c81b704cfa44fe64cab18e321fe328ef2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF8 11584 bytes

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