Malicious PDF — malware analysis report

Static analysis result for SHA-256 1835447bde4e4e65…

MALICIOUS

PDF

40.8 KB Created: 2020-08-08 12:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7d9c56e71d4c2580658453e6da58016 SHA-1: afb1337d17c68d31d0977b7400e3c3511193fdba SHA-256: 1835447bde4e4e65f4ba39438e9b4cbb66ef0c1cd65e21a9d7c64a7789bc796f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a solutions manual. It also features a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.com/wb?keyword=student%20solutions%20manual%20for%20operations%20research%20applications%20and%20algorithms
    • http://files.thewnewesterner.com/uploads/1/3/1/4/131407493/1cd7dfd6d.pdf
    • http://files.levental-lab.com/uploads/1/3/0/7/130775241/zukajilaxokaje.pdf
    • http://gowefag.vmnshenandoah.org/uploads/1/3/1/4/131483281/7391856.pdf
    • http://files.vandailyblues.com/uploads/1/3/2/6/132695248/bewibijorilema-tusevolimiz-vijerugeb-juzixuxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/badorepuwubatusibeko.pdf
    • https://cdn.shopify.com/s/files/1/0439/1842/6267/files/atomic_habits_by_james_clear.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/number_recognition_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/almonard_fans_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/gogowoxibuzipudedebemenez.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/93287853456.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/koxigazupijorawumupuder.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/dopokisak.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/xarixujolakafimoxapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1551/0938/files/glasses_case_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/completing_the_square_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/joruvidexixe.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_off00005d46.bin
5550b2d05f160e8f03c5d1dc3928c1784730c0ccf088d019ca390b7c95bb8e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D46 5672 bytes
font_01_sfnt_off00007063.bin
f483a1c2787b8560e4597ea84486280d533fbd11314fde6c1aa26bca30fa50f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7063 10840 bytes

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