Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b50f570c1ac294…

MALICIOUS

PDF

35.4 KB Created: 2020-08-10 02:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d7459d07b245f1c651f1990b098c911 SHA-1: 94aa26a505dbaccea7739681c8e745e408939edf SHA-256: 04b50f570c1ac2943bcc78b2317347631c671e1afcff1c10a4446e7e07e2f512
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=present+perfect+tense+questions+exercises+pdf', suggesting a lure to a phishing or malware distribution site. The presence of a link farm heuristic further indicates malicious intent to distribute or redirect traffic.

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=present+perfect+tense+questions+exercises+pdf
    • http://vewid.peterarmstrong225.net/uploads/1/3/1/4/131453494/xuxik-wilexibanasa-muxuzikuwigila.pdf
    • http://files.silvaweb.net/uploads/1/3/0/8/130814132/xitowimap.pdf
    • http://files.keepjudgecook.com/uploads/1/3/1/4/131438567/xoxepigarega-rabojometogake-rojisare-fivogapix.pdf
    • http://files.bcrenergygroup.org/uploads/1/3/2/6/132696558/979851.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/how_do_you_rearrange_pages_in_a_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/2130374638.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/jonugowezuf.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/all_of_me_chords_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/zisumoziwenijonuzexakani.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/derivation_of_lens_maker_formula_for_concave_lens.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/bokadowabopadufofiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/dikedafizim.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/61212972262.pdf
    • https://cdn.shopify.com/s/files/1/0452/7525/0849/files/platelet_rich_plasma_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0180/files/aromaterapia_curso.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/62491929455.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/blue_oyster_cult_agents_of_fortune.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_off00004da3.bin
cbb61e440a58abdc7cefd785830308d788e60d2d796c8bdc365f0908a2979fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA3 5104 bytes
font_01_sfnt_off00005f13.bin
35b529d3e874e5bb69e798d304e1caa0a57816336dc982b3cbdec4104c2021ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F13 9672 bytes

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