Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a34f88c4b886fed…

MALICIOUS

PDF

58.2 KB Created: 2020-08-08 23:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbd9997a36c5c7f10c75e6ee16353c4e SHA-1: fc712224ea038be87d6067b268d47af59986729e SHA-256: 5a34f88c4b886feda8a394270cfbc06557f4b3ae9983dead7bcd7010e7c6727b
162 Risk Score

Malware Insights

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

The PDF contains a deceptive link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL and a lure related to "Algorithm analysis and design mcq with answers pdf". The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=algorithm+analysis+and+design+mcq+with+answers+pdf
    • http://files.biogeographyresearchlab.net/uploads/1/3/1/8/131856146/teroropenifosupux.pdf
    • http://files.drylanddevelop.org/uploads/1/3/1/0/131070192/fubalurulopiw.pdf
    • http://files.bishophillcolonystoreb.com/uploads/1/3/1/4/131438523/ribesididiwisokan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/47512799148.pdf
    • https://cdn.shopify.com/s/files/1/0434/3771/9717/files/book_design_layout.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/32942283700.pdf
    • https://cdn.shopify.com/s/files/1/0439/8628/8798/files/domino_s_pizza_menu_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/divi_image_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/gizibakajateruguwuse.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/car_camping_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/git_cherry-_pick.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/artikel_jurnal_akuntansi_biaya.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6163/files/72359147569.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/jolipubituzur.pdf
    • https://cdn.shopify.com/s/files/1/0453/9252/7528/files/alchemist_game_rules.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b145.bin
d5ef1428cf655e19f882fd8ade64246d66969d7ace6ed5de6fd55583915f152c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB145 23356 bytes
font_00_sfnt_off00006f76.bin
d102d3fb4a65b02b8e35ff2ad5e2428e32cfb2fbc6e621c3fac279e00c81cabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F76 5880 bytes
font_01_sfnt_off00008361.bin
e0f08bc1c3999d4d1616af2c12d0e01254bba58353c1a467281c5a426da01589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8361 14708 bytes

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