Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f442b74523ff99…

MALICIOUS

PDF

41.4 KB Created: 2020-08-23 16:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dda732d7416a5e458d66e26c679dcf5e SHA-1: fae3794f3776e2a54fd81cf10cff2de58c932ca1 SHA-256: b0f442b74523ff99f518b81a1bdf72b95eb712566250e25a532fa02cabda1012
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm' due to the mass of external PDF links. The primary malicious URL identified is https://ttraff.ru/pify?keyword=acca+f5+dec+2016+answers, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious URL, suggesting an attempt to lure users to malicious infrastructure.

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=acca+f5+dec+2016+answers
    • http://files.njenvirothon.org/uploads/1/3/1/3/131379183/1b8e028.pdf
    • http://raxotoxit.cheltenhamprintguild.org/uploads/1/3/1/0/131070374/nagukox.pdf
    • http://files.xr103.com/uploads/1/3/2/8/132814949/fec31daa32522.pdf
    • http://jevade.danitzaorendain.com/uploads/1/3/1/6/131636719/fexebegevinaxi_mipaxonijumej.pdf
    • http://files.nourishandthriveforlife.com/uploads/1/3/0/9/130969917/gekilas-xupewakebad.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/badanamu_sing_the_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/dakosedabukugegusupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8414/4037/files/fosulematagoguvebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/8830481397.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/mopopimisoraviwepofexupa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0405/8010/files/analyzing_and_interpreting_scientific_data_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/megesupugigukerir.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4284/files/definition_of_culture.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/sutivupepuzadikarewawaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/516274390.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/67431805317.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/talujerodex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.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_off000061f9.bin
81bf2fdd158c3bf30aad9cd4ee3e28d543dd4b0b151fb50d6b849339e3023f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 5668 bytes
font_01_sfnt_off0000756c.bin
61f8a0553a4756934cfd064a2430df96b9b0447b6c793c66df4e51a87c7c0de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 10420 bytes

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