Malicious PDF — malware analysis report

Static analysis result for SHA-256 9161706807f44797…

MALICIOUS

PDF

61.5 KB Created: 2020-08-19 01:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f64511e41f327e7b1b2d9525c2cd9d74 SHA-1: bc40c20015055391be4580966b6c35dd9388c236 SHA-256: 9161706807f44797f114aab930882bfe33daef8f0684cfca9bc4781b65a18162
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=dd+news+reporter+list'. The majority of the embedded links point to Shopify domains, suggesting an attempt to create a deceptive link farm. The ML classifier also strongly indicated maliciousness.

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=dd+news+reporter+list
    • http://files.vtk9.com/uploads/1/3/1/6/131636855/nijixivow.pdf
    • http://files.xofitnessstudio.com/uploads/1/3/1/3/131383648/0c6d0c493fd3d8.pdf
    • http://files.shanghaitranslator-businessinterpreter-personaltourguide.com/uploads/1/3/0/7/130738785/favam.pdf
    • http://files.bnmartialarts.com/uploads/1/3/0/7/130740213/9712655.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/pdf_file_download_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/renaissance_architecture_in_italy.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/77971132340.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/nekasavesurijigidaxup.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/80730252878.pdf
    • https://cdn.shopify.com/s/files/1/0431/6554/8705/files/xuloxuzozuxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tesip.pdf
    • https://cdn.shopify.com/s/files/1/0454/4040/1566/files/arivaca_lake_fishing_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/jazz_guitar_chord_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/xelutebud.pdf
    • https://cdn.shopify.com/s/files/1/0429/3017/6159/files/possessivpronomen_akkusativ_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/simetefedeliga.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/85038291175.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/63095956554.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_off0000aa45.bin
393c2b1bc4379b642b54d0bf639a8b7f4b0f9139b0a1755b520840f193e74d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA45 4836 bytes
font_01_sfnt_off0000bad9.bin
e92a6a97812f7712c6182945193d3c6395fc63c65959b2e931ac5923a8037130		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD9 14772 bytes

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