Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d8c8f51c778895…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 20:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8cb4cefe3feb303f643f26f8c3613e0 SHA-1: 68b83a6e52d846e5f4520d618a062ac12628941a SHA-256: b7d8c8f51c778895410ffef441d316ca69205d9030246ff4e6de0ef10a30090f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=psicologia+de+la+emocion+uned+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=psicologia+de+la+emocion+uned+pdf
    • http://files.wlreading.org/uploads/1/3/0/7/130775371/a27cb4591.pdf
    • http://fogavi.laurablatterman.com/uploads/1/3/1/4/131437402/gamejumoz_miximafanixow_fenikoxakituwex_vibazed.pdf
    • http://files.roseandwild.com/uploads/1/3/1/6/131636889/vozamu_runuke_jotuk.pdf
    • http://senome.exerciseoutsidethebox.com/uploads/1/3/2/6/132681504/xofuvuve.pdf
    • http://files.lucioconstructioninc.com/uploads/1/3/2/6/132696233/sowexidabiju.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/asvab_sample_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/human_anatomy_and_physiology_coloring_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/vakorewumaronasotobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/pong_game_java.pdf
    • https://cdn.shopify.com/s/files/1/0438/1242/1789/files/geguzal.pdf
    • https://cdn.shopify.com/s/files/1/0438/2267/8173/files/89701630985.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/pijunudewimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/55413904988.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/rotalaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/12495986099.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/bometaxitirubilaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/arnold_ehret_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0439/8029/2254/files/luseruvafoke.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_off000066c9.bin
b89f948ffe81c611d4ca284943f4bd03d97ee075cb4b7978b7ebd03874989bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C9 5380 bytes
font_01_sfnt_off00007900.bin
1071a87cdc926a81dc8d515b68c978bf56fe709d457278ea4aa882257c76b1bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7900 11412 bytes

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