Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c22a5ea832d6aa0…

MALICIOUS

PDF

51.7 KB Created: 2020-08-10 13:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c273253448b8f886635b74abb642895 SHA-1: 93c1da6cf2cb4e4d44366f4a4dac4655e5782d5b SHA-256: 7c22a5ea832d6aa0ab4babacd7de6c5a2710889e0bc75cdf1ae9ed7d5242b997
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically a redirector at ttraff.cc. The document body, though partially corrupted, suggests a lure related to scholarship recommendation letters, aligning with phishing tactics. The ML classifier strongly indicated maliciousness, and multiple heuristics flagged the PDF for malicious redirector links and link farming.

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=recommendation+letter+for+scholarship+from+employer+pdf
    • http://files.raceworkscoilovers.com/uploads/1/3/1/1/131164446/d8e330ab5effe7e.pdf
    • http://files.jopond.com/uploads/1/3/1/8/131856212/tadodoxifividos.pdf
    • http://files.playsforkidstoperform.com/uploads/1/3/1/0/131069992/9620890.pdf
    • http://jofulo.ayurglow.com/uploads/1/3/0/9/130969754/4026328.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/mukujevada.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/morphology_and_taxonomy_of_angiosperms.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/matugezaxidun.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/18586943727.pdf
    • https://cdn.shopify.com/s/files/1/0440/6152/4118/files/starplex_cinema_rio_grande_city_showtimes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/46321670591.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/54125911675.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifezunelavezide.pdf
    • https://cdn.shopify.com/s/files/1/0438/8156/2280/files/bogipuzasafikevatoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/13088443209.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/bozevudidaredogeteveve.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/quantum_machine_learning_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/nuxomegediwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/vlookup_formula_in_excel_with_example.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_off00008aba.bin
cb84d8c28364ad9a41571d2a28961300ce36bb8bd27d9ebb353890e23c3d97ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABA 5504 bytes
font_01_sfnt_off00009d45.bin
a9959a3fb05c6b1c5167d033e3c436b1f2e84031932f7ff7f73d4c31b4b9ad67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D45 10456 bytes

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