Malicious PDF — malware analysis report

Static analysis result for SHA-256 373d22577b52f727…

MALICIOUS

PDF

33.7 KB Created: 2020-08-06 03:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab886c87ce4dad538d61205b8d120faf SHA-1: cca7bb69f7998f08c46bb3eb5beb4ef2d2b8d379 SHA-256: 373d22577b52f727f01cf001edb00cc3ac2dc1f0ccd1769de3b82b4aa6d4d2be
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links redirects to a known malicious infrastructure at 'ttraff.ru', suggesting a link farm or redirection tactic to obscure the final malicious destination. The document body text, though partially corrupted, indicates a lure for downloading 'encyclopedia of dog breeds pdf free download', aligning with the observed link farm behavior. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=encyclopedia+of+dog+breeds+pdf+free+download
    • http://files.healthytritowncoalition.org/uploads/1/3/2/8/132814958/kibedejosop_sopubazuxadofe_biteviwidira.pdf
    • http://files.legacyhealingretreat.org/uploads/1/3/0/7/130774962/4123166.pdf
    • http://files.newspark901.org/uploads/1/3/2/8/132814958/2737278.pdf
    • http://files.ywcahealthandfitness.org/uploads/1/3/1/4/131407655/72f0f.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/govelabuzeriwaxabilox.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/sunatujewomudaxumarorikuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/47282017359.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/83718887378.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9670/files/47092232675.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/lesenufunexarefesatubi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3780/0086/files/kafik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/58297166074.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/xadezumoxutenidodevelaves.pdf
    • https://cdn.shopify.com/s/files/1/0436/1024/3230/files/rules_in_naming_inorganic_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/automatize_tarefas_maantes_com_python_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tosinumemelijigejidab.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/nitaxirebedakuk.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_off000047c5.bin
c0bf6b323c96eb55b240897cdf5f893de089df07d5a779c8734b9d7e7d682d15
pdf-font-stream PDF embedded font (sfnt) at offset 0x47C5 5616 bytes
font_01_sfnt_off00005b09.bin
6365ebb739568ab01f2ecf2bb3c24a47efc4632cbb0b5b7ae7220923358375c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B09 9000 bytes