Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb78d537608864d8…

MALICIOUS

PDF

78.0 KB Created: 2020-08-11 06:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e007401f0c9d2dbd04231929b2d02457 SHA-1: 896ed2cba60ec623edb695e809726f04ea39a223 SHA-256: fb78d537608864d8c793094075126eaec07696ab8143c545fc3d8c5a72364a9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=marxism+and+liberation+theology+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on domains like cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to malicious infrastructure via deceptive links within the 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.ru/pify?keyword=marxism+and+liberation+theology+pdf
    • http://files.caasfepconference2020.org/uploads/1/3/0/8/130813095/8387626.pdf
    • http://files.pipandwillys.com/uploads/1/3/2/6/132682051/86101695dbb20.pdf
    • http://zapen.scoil-mhuire.com/uploads/1/3/2/6/132683014/7022809.pdf
    • http://zapen.scoil-mhuire.com/uploads/1/3/2/6/1326
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/flash_download_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/bafipef.pdf
    • https://cdn.shopify.com/s/files/1/0438/3404/8669/files/6210392037.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/jogivilomutowedive.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/trane_xl624_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/bulletproof_roadmap_diet.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/94160947888.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3640/files/accuracy_and_precision_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/tepanubojugiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/dajexanimetofisogi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/38593527285.pdf
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/zudoferawiledexufo.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_off0000f4a6.bin
c21552c1eef5b930d48f93c54a0f63621fe9c8f7233c5178d69254e28ed1c32d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 5768 bytes
font_01_sfnt_off00010830.bin
59f3ba184e5cf8fe2428c750eaffa0ea9c8ce35a9ace90e1850cd248ca612d6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 10176 bytes