Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed0d99920a17d13…

MALICIOUS

PDF

42.8 KB Created: 2020-08-23 08:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6bf3b3e02beea1bf3600446188fd5c5 SHA-1: 4b087f356c8d23755f97b44a4a2759cd8554e288 SHA-256: bed0d99920a17d1387f8d5c87273429cc9d663b5d138f900e28b699fc6cfeef7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text related to 'rent to own lease agreement pdf' and a URL that appears to be a lure. The primary heuristic firing indicates a malicious redirector link, suggesting the document's purpose is to redirect users to malicious infrastructure. No scripts were extracted from this sample.

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.ru/pify?keyword=rent+to+own+lease+agreement+pdf
    • http://files.citycomedyclub.co.uk/uploads/1/3/1/1/131164556/kalimun-dutolamuzexa-maxijadile-wudufofudorejes.pdf
    • http://nogaja.charterfishingbradenton.com/uploads/1/3/1/8/131856271/0e8f9ffb56ec.pdf
    • http://files.shaikheskander.com/uploads/1/3/0/7/130739578/kivujovepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5478/files/64978413773.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/85588430776.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/49124879912.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6706/files/82328064352.pdf
    • https://cdn.shopify.com/s/files/1/0431/9415/5157/files/zedoda.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/snakes_and_ladders_board_game_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/55968784292.pdf
    • https://cdn.shopify.com/s/files/1/0439/8972/9438/files/bise_lahore_9th_class_gazette_2020.pdf
    • https://cdn.shopify.com/s/files/1/0454/1965/9420/files/ambareesha_movie_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9814/files/anfotericina_b_bula.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1851/files/probabilistic_programming_and_bayesian_inference.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/vabukibopofafosewovig.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3137/files/most_common_english_words_with_bangla_meaning.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a13.bin
4d93dfad558df9a155c8c7dcfdeb814c40089e6431e99f57a35c999118bcd327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A13 5460 bytes
font_01_sfnt_off00007cac.bin
416106abc2bcb647120482f26b6ba03bef6a997833a11ab0c223c3451928715e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAC 9852 bytes

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