Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3bb23cf3119080…

MALICIOUS

PDF

49.5 KB Created: 2020-08-14 10:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f592f4cd088571ea7c2f9d614b2b8d7e SHA-1: d08de8a6adce386d9723e1e0c043ffeb23556688 SHA-256: 5b3bb23cf3119080451960fb0a950e203ba7598772e3bdb5642e230e30ff3b95
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious or redirector infrastructure. The document body text, though obfuscated, includes a URL that appears to be a lure for malicious content. The heuristic firings indicate the presence of a link farm and a malicious redirector, suggesting the primary purpose is to direct users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=break+free+ruby+rose+mp4
    • http://files.flawlessreflectionsautodetailing.com/uploads/1/3/1/4/131409037/430701.pdf
    • http://files.tuiridgeaustralianlabradoodlesnz.com/uploads/1/3/2/6/132695663/d7a0a80c964c596.pdf
    • http://files.zip-dang.com/uploads/1/3/1/3/131383664/gadizubobowow_kufusu.pdf
    • http://files.sports800.com/uploads/1/3/0/8/130874477/kewokebafeza-nekiku-runudufumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/8277/9541/files/jivagonutopuwuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/338744157.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/3768444132.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/46711585860.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/vosurujal.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3690/files/71872151508.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/32161344247.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/osrs_black_demons.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/puvikij.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/77061960327.pdf
    • https://cdn.shopify.com/s/files/1/0429/6533/6217/files/student_budget_planner.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/58255535574.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6295/files/the_science_of_accelerated_learning_book.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006500.bin
0648c7053e5102b8cd87763c11d6df576c85a52580786f21b91d7941638baf93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 5460 bytes
font_01_sfnt_off00007787.bin
cb9e2c6be692d77f55e1bda77a2650542e5d8436e83fabc3f887424cd0255fdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7787 9872 bytes
font_02_sfnt_off00009997.bin
e58e8e8d3617fa2f52d62469859eb662c26c1c1537dc21f5cc6f1aa71eaa6aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9997 18776 bytes

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