Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e421e51ba84e385…

MALICIOUS

PDF

47.9 KB Created: 2020-08-24 09:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d92be70c6c73e6a6d9167221c8375e SHA-1: b902909282de541af49f74846fcac653de7d68ff SHA-256: 0e421e51ba84e385517ca2e6872e79d9b8b5254e6a66680b909fb2b0995c7546
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to link farms and a known malicious redirector at 'https://ttraff.ru/pify?keyword=aptitude+test+sample+apk'. The document body text and heuristic firings indicate a social engineering lure, specifically a browser extension or update installation prompt disguised as an aptitude test. This suggests the document is designed to trick users into executing malicious code or revealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=aptitude+test+sample+apk
    • http://files.thehappyfits.com/uploads/1/3/2/6/132681482/11c9f.pdf
    • http://files.yenbai.life/uploads/1/3/0/7/130739340/depuxewodirekabamir.pdf
    • http://kekelut.boltonpestcontrolandprevention.co.uk/uploads/1/3/0/7/130776445/2484562.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2329/2840/files/difference_between_inflectional_and_derivational_affixes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/28613507361.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/avon_brochure_july_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/hurt_nine_inch_nails_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2445/files/feduf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/73959507215.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/75087116682.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/alter_ego_plus_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/iris_data_set_csv.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/82378376960.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9797/files/go_battery_saver_pro_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/yin_yang_drawings.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_off00007db1.bin
716198a1b05540925cedd55cf970068fcb24bcf2e176313d6267c21a99aa62e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB1 5060 bytes
font_01_sfnt_off00008ed4.bin
13e8a8f4fc965f93b1b2e07f538f0db14b56d98eb7a4be3781227650af848484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED4 10572 bytes

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