Malicious PDF — malware analysis report

Static analysis result for SHA-256 8096fae34fc5da79…

MALICIOUS

PDF

43.1 KB Created: 2020-08-06 00:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba87042b8f9898c23879d82a29add92d SHA-1: 23de0297f16a96613f3c586aa7774fab2d4164cb SHA-256: 8096fae34fc5da7942d245d193f8580c6d7899ae876ab93db971d6ac05cd0f23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily corrupted, contains the URL 'https://ttraff.ru/pify?keyword=issuu+download+pdf+android', which is also flagged as a malicious redirector. The presence of numerous links suggests an attempt to manipulate search engine results or lure users to malicious sites.

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=issuu+download+pdf+android
    • http://xobifegi.westaflearningcenter.com/uploads/1/3/1/4/131453996/dakivasoxawure-balofojixufa.pdf
    • http://files.mymoonmalas.com/uploads/1/3/2/6/132696112/12c5b58532.pdf
    • http://files.ohscounseling.org/uploads/1/3/0/7/130740502/79fbade6ff977b.pdf
    • http://files.baycityenergysmart.org/uploads/1/3/1/0/131070535/sufavukipojukosejar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/mebaxozivezobujusuzidudiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/9473/6037/files/53849186211.pdf
    • https://cdn.shopify.com/s/files/1/0429/3092/9827/files/saxox.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/dark_souls_2_classes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/book_review_example_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/rejeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/should_i_stop_autocomplete.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/indonesia_business_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/83991327373.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/counter_strike_source_themes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b8b.bin
dabcd75a61aff24796b3457f5d62c96da5025819439575b40aafdde7aad8adda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8B 10172 bytes
font_01_sfnt_off00006cda.bin
18f0e2f54fc9677f96a09d71f93f34efbae9b1eb3b0d3fbe5342bf145c6a1eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 5064 bytes
font_02_sfnt_off00007e37.bin
e479d62e404420c1e98675c04b91dad1448228a354685167874d9036cc7e8502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E37 9740 bytes

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