Malicious PDF — malware analysis report

Static analysis result for SHA-256 71887fb45a4341d9…

MALICIOUS

PDF

93.6 KB Created: 2020-10-04 16:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187ae2afc455e2ebde7d651ce5751466 SHA-1: 278a7c6364e274b5f2dad2f9c33eeab3357ca772 SHA-256: 71887fb45a4341d9010a4642a05b6091167d3367ac8e68e7d7bc24ca1af1b356
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to Shopify domains hosting PDF files, suggesting an SEO poisoning or link farm strategy. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=%25C3%25B6%25C4%259Fretim+ilke+ve+y%25C3%25B6ntemleri+ders+notlar%25C4%25B1+slayt', which is highly suspicious. The document body, though heavily obfuscated, contains this same URL, reinforcing its malicious intent. 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://ggtraff.ru/strik?keyword=%25C3%25B6%25C4%259Fretim+ilke+ve+y%25C3%25B6ntemleri+ders+notlar%25C4%25B1+slayt
    • http://kifemis.cancercoloring.com/uploads/1/3/1/0/131070450/380a04d2c66c5bc.pdf
    • http://jizezose.dazeyjayne.com/uploads/1/3/1/6/131636947/9055105.pdf
    • http://juxesa.baydreamsleep.com/uploads/1/3/0/8/130815009/76c061c6.pdf
    • http://files.redenviroforum.org/uploads/1/3/0/8/130873738/vuraripukatujij.pdf
    • http://files.uckfielddivas.org/uploads/1/3/1/4/131437413/lijexodidowizu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0485/4435/files/animals_in_arizona_list.pdf
    • https://cdn.shopify.com/s/files/1/0483/3204/6489/files/neck_pain_disability_index_scoring.pdf
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/sony_dvpsr510h_dvd_player_with_hdmi_port_upscaling.pdf
    • https://cdn.shopify.com/s/files/1/0460/1967/4271/files/sims_middle_school_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0465/4311/0302/files/all_aboard_games_kamloops.pdf
    • https://cdn.shopify.com/s/files/1/0439/3759/5560/files/atlantic_research_group_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/33133070241.pdf
    • https://cdn.shopify.com/s/files/1/0498/5854/3771/files/vekodirinoveganini.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d37.bin
74e5ca8645c78242e17cfcf75cf1568d1a5f734c3badfdf6a9959c54870d0fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 5656 bytes
font_01_sfnt_off00014029.bin
11c03df595417269fec6d6b38acc6c67e1934f426032ae2ac2ddf15bb1191f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14029 12332 bytes

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