Malicious PDF — malware analysis report

Static analysis result for SHA-256 5142911cf30ef21c…

MALICIOUS

PDF

39.5 KB Created: 2020-08-22 03:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c1c8a919c20d85bd90f78202e6f474 SHA-1: 9c844b414b4150e707dd6401a1fe494d6c14b3ce SHA-256: 5142911cf30ef21cd61ed426a3be1ebd25b41d12cc5a6f4fe6adc27aaf4551bd
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of the link farm, and the PDF structure reveals numerous embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.ru' which is flagged as a malicious redirector. This suggests the primary purpose is to lure users to malicious sites.

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=doorbell+transformer+humming
    • http://files.eddefenseleague.org/uploads/1/3/1/8/131856492/doneronetidap_titaw.pdf
    • http://files.faithwesleyan.org/uploads/1/3/0/8/130814907/3960876.pdf
    • http://xenumib.bhenergyshootout.com/uploads/1/3/2/6/132683169/worunogavowenor.pdf
    • http://files.merrillsoccer.org/uploads/1/3/1/3/131398250/boluvewefaxovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/t_shirt_order_form_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/75858566377.pdf
    • https://cdn.shopify.com/s/files/1/0432/2964/2916/files/28828148888.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/behringer_mixer_xenyx_802_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/90810891410.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/66024249962.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/73851493308.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/app_scanner_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/likojidisutoxozabawoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/ribugugarasuvitutaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1430/files/selenium_eclipse_tutorial_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/mapebotajuzopixofavu.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_off00005c62.bin
af552f4ac06d4acc0d18591604f0c73a0602750ab664b6591a68a3bceb5728ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C62 5320 bytes
font_01_sfnt_off00006e4b.bin
51f9b9173c98c34a16e30cd4b66905d0f91ce538011215ab1897c867a5bf02ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4B 10260 bytes

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