Malicious PDF — malware analysis report

Static analysis result for SHA-256 acde5cf341fa3059…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 08:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3769cc5c2eeccb89d3bf576f9b49cf6 SHA-1: b8a25f23741d6678ab95e3216cf32ac94ac01264 SHA-256: acde5cf341fa3059d8a0045b114614e3642c9634a7675b9a2c7bdc9ee4a8ad1f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify and other domains, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user via a deceptive link within the document.

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/pify?keyword=battery+load+test+procedure+pdf
    • http://fomegukus.reikicottage.com/uploads/1/3/0/9/130969356/3087454.pdf
    • http://files.paylesscarpetcleaning.com/uploads/1/3/1/4/131455680/fokifetesan_tadutesal.pdf
    • http://files.wickedsimracing.com/uploads/1/3/1/8/131856186/7412833.pdf
    • http://files.taftbands.org/uploads/1/3/0/9/130969356/rajeliji.pdf
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/repokowalelipawax.pdf
    • https://cdn.shopify.com/s/files/1/0439/1606/6971/files/spanish_grammar_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/greenhouse_gases_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3511/files/19396643506.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/87477486447.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/gutizijexadafavekegiluv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/57354368619.pdf
    • https://cdn.shopify.com/s/files/1/0430/2949/5959/files/44972883493.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/biology_one_liners_for_ssc_cgl.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/essentials_of_firefighting_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/8993/6025/files/sotezurozezute.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49470024852.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/jofebinazeli.pdf
    • https://cdn.shopify.com/s/files/1/0438/4954/7938/files/erling_kagge_silence.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_off000063f2.bin
c0df552ccdf0d5b86bd4de0f04446f722247ede89ca00255ba6d800742031139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F2 5300 bytes
font_01_sfnt_off00007613.bin
486a2ab180f5e277c7298251ce5046eb54b207b3038c99dd3ab546b741faa174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 10324 bytes

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