Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d4d159d2b111f8…

MALICIOUS

PDF

56.7 KB Created: 2020-08-18 22:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acc4f176f6ae485c0aa3df4114df55be SHA-1: b5dc69903506f6ea5a98637f81f5f3678f3851af SHA-256: 16d4d159d2b111f8243400f35f1b84b25ef1bb9ea5bd78beba6c1fa75e5e69c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a high number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains garbled text but includes a URL that is also present in the heuristics, indicating a potential redirection or download attempt.

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=sodium+dodecyl+sulfate+sds+pdf
    • http://files.ae.ariatlandingpage.com/uploads/1/3/0/7/130775983/xatewonagiregimud.pdf
    • http://files.rutherglenlamaisonstarnaud.com/uploads/1/3/0/8/130814065/092cc0ebdec0a9.pdf
    • http://bokamovur.foodyounebes.com/uploads/1/3/1/4/131437254/xoroxe_ditewiv_kozuxigal.pdf
    • http://files.sufiireland.com/uploads/1/3/0/7/130740211/letexa_babonewose_tozexesavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/sinilapikininam.pdf
    • https://cdn.shopify.com/s/files/1/0437/0975/9641/files/gokixuwufemanatevirame.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/dapisalupafibazite.pdf
    • https://cdn.shopify.com/s/files/1/0438/0803/0882/files/the_next_font.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/bed_sheets_meaning_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/feledododobufupimijisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/82879391703.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/lavagamavijezuxozogekiz.pdf
    • https://cdn.shopify.com/s/files/1/0450/4076/3030/files/super_metroid_rom_hacks.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/atul_prakashan_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/fundamentos_de_bacteriologia_atlas_a_color.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1311/files/80614096791.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/92881260637.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4514/files/83579604631.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_off00009e8e.bin
feab11d826ddcc7ce9445a1e32682e30c4961c1a35f573844d9dbb6bd0f6c101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8E 5408 bytes
font_01_sfnt_off0000b0ea.bin
4d528342a98985f4c0ddf968fb2b70b8af95d3f841d007492b70938d4f17e670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 10864 bytes

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