Malicious PDF — malware analysis report

Static analysis result for SHA-256 724b3f25653825fc…

MALICIOUS

PDF

42.1 KB Created: 2020-08-10 07:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1bab04974c4d22eed9d83a8988bde08 SHA-1: d6b5e5e42e21b7de7255eca1f2cbe4812d8621b3 SHA-256: 724b3f25653825fc452979e09c7ef83cb189f45579c5b3bb2601be30460d603c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, suggesting a phishing or spam campaign. The primary malicious URL identified is https://ttraff.com/pify?keyword=accumulator+function+in+hydraulic+system+pdf. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The presence of a large number of external PDF links indicates a link farm strategy.

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=accumulator+function+in+hydraulic+system+pdf
    • http://wiriki.caribelli.com/uploads/1/3/2/8/132814930/nezagovuborawo_wexoditiwa_bulodijidokaj_mopegari.pdf
    • http://files.fanfaresandreveries.com/uploads/1/3/1/4/131454049/fde917f.pdf
    • http://files.artbeyondthedivide.org.au/uploads/1/3/0/8/130813325/vevopirinofuruzevu.pdf
    • http://files.thegolfadventure.net/uploads/1/3/2/6/132682919/c24403a61aa133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/63092160132.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/naruto_shippuden_episode_30.pdf
    • https://cdn.shopify.com/s/files/1/0428/0975/3767/files/39676926265.pdf
    • https://cdn.shopify.com/s/files/1/0434/3611/4076/files/62228638522.pdf
    • https://cdn.shopify.com/s/files/1/0437/6087/7729/files/courage_book_by_osho.pdf
    • https://cdn.shopify.com/s/files/1/0435/2399/7856/files/lajeniwesavulopofuvas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/rugusiroduvafikepesuvog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3367/3380/files/32793985683.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5264/files/sugajerifukidoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/mitamevifozotilexilega.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/calendario_serie_d_girone_d_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/57489535246.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/curso_de_violo_completo_em.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6554/files/pojanowixusu.pdf
    • https://cdn.shopify.com/s/files/1/0454/4672/5790/files/morogakepururirijiv.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_off000066f4.bin
a8774a2c7167a987d6407e00f27122bf6309e9aa69136f978250cd2160cf10e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F4 5484 bytes
font_01_sfnt_off0000797f.bin
8e8136045b17854c33f1f164971917daab176abe1f1f15802449349f839d0805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 9780 bytes

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