Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c465a53e5bb222…

MALICIOUS

PDF

47.5 KB Created: 2020-08-10 06:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f1fe706eb20dfef954b3bedfae7809c SHA-1: 98bfbc309b26a23b21003c85a3f90d318f7cd96f SHA-256: b6c465a53e5bb222902b8569651725408fcb0131010a43a55d52954a3c8876fc
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obfuscate the final malicious destination. The document body, though heavily obfuscated, contains the same URL and references to Alzheimer's pathology, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=alzheimer+pdf+patologia
    • http://xakabek.thetrick.fr/uploads/1/3/0/8/130874493/suwumuduve.pdf
    • http://files.prestige-yachting.com/uploads/1/3/2/7/132710627/rewizelibuxumu_fusogopa_zapatakelaba_gakosija.pdf
    • http://files.idoflowers.net/uploads/1/3/1/4/131453291/47c904717fc0b67.pdf
    • http://files.buddhacbmr.org/uploads/1/3/1/3/131398406/pojivon_feneloxijaxuruj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0447/6128/4757/files/combine_powerpoint_files.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3445/files/bavizez.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/jisebozuduvekebusimi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/36741646331.pdf
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/61203431248.pdf
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/carol_of_the_bells_vocal_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/legifowifusibikajopivimi.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/goleti.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/31855144781.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65107231385.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/xetonapebewa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4292/files/absolute_value_word_problems_worksheets.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_off00007b5b.bin
49f861c87b349f829e8b5567337315e663b283b78a9ae42a8b3e70d944a8989c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5B 5316 bytes
font_01_sfnt_off00008d4f.bin
53c1ef6980a5902822a73e111e2644031c6952a79958e4fdb293b17e8df85ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4F 10608 bytes

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