Malicious PDF — malware analysis report

Static analysis result for SHA-256 2178335ca1d73718…

MALICIOUS

PDF

40.5 KB Created: 2020-09-13 13:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ab4acea1c67ea9a608acd81db05ee0 SHA-1: 5ddc5f00157bc12d29fa860622649d8d4e134c4d SHA-256: 2178335ca1d7371823ba3d939f7f0df4a78fb1a7b195dc31ad21b4fa99e85b4b
150 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure via the URL 'https://ttraff.link/pify?keyword=biological+molecules+worksheet+answers'. The document body, though heavily corrupted, appears to contain the text 'Biological molecules worksheet answers', suggesting a lure to disguise the malicious links as educational material. 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.link/pify?keyword=biological+molecules+worksheet+answers
    • http://jagivof.brennanfamilytree.info/uploads/1/3/1/3/131380600/1284601.pdf
    • https://cdn.shopify.com/s/files/1/0447/2622/3001/files/3950375512.pdf
    • https://cdn.shopify.com/s/files/1/0447/7750/4925/files/bootstrap_modal_popup_form_validation_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/4990/0439/files/b1_english_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/nissan_almera_tino_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/lubujol.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/dijifapipotelizamivipupu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/lipedowufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/jetixaburiberiso.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5123/files/fukunobukojumifewugita.pdf
    • https://cdn.shopify.com/s/files/1/0435/8147/2929/files/dudezomagonowa.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_off000060f8.bin
b5c92497c2d7f2936ebb7a5f5af09891c57f6b7c636450dff1157db10ed662ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 5420 bytes
font_01_sfnt_off0000734e.bin
c3327c10e8a680650446369a62b76755c4bb4e9506d36df341dd1d4457c3cfcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734E 10052 bytes

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