Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8476eff14b6fbf…

MALICIOUS

PDF

56.2 KB Created: 2020-08-31 15:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a78a2b02f819e8a5d12abf0e7b65671 SHA-1: 13bc5d1849e9286f2882ffda5d8840d89f459aa4 SHA-256: 2d8476eff14b6fbf3992fe125fcd5fc8e2f1478abd1ba2a11d398b2a80dba5e4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for academic content, and the URL itself includes a book title. This suggests a phishing attempt to redirect users to malicious sites under the guise of providing a document. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=review+handbook+in+diagnostic+bacteriology+rodriguez+pdf
    • https://cdn.shopify.com/s/files/1/0438/8493/7384/files/54771687115.pdf
    • https://cdn.shopify.com/s/files/1/0438/8188/9960/files/the_knight_s_tale_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/pusasatusu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/xevuwexurifewukopidebivut.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1687/files/folotalibalafagev.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/86684006524.pdf
    • https://cdn.shopify.com/s/files/1/0432/2846/3271/files/temowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/how_to_delete_discord_messages.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/jodilijasaduregilejuwigon.pdf
    • https://cdn.shopify.com/s/files/1/0439/1141/3912/files/nafixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6119/9526/files/75135929382.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/administrative_law_course_outline.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/wukufe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/joxurukevib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/subaru_adaptive_cruise_control_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/bouncin_on_my_dick_tyga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090b3.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B3 2828 bytes
font_01_sfnt_off00009aad.bin
28e3892ca03460e7586e48340d257d5ea528149103ced762723df580fef3aa47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAD 5932 bytes
font_02_sfnt_off0000af02.bin
a34fe316763c7256b16835eb571b964083fe44f74a8080bd8096bf39a1785894		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF02 10012 bytes

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