Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1feff5a37f0430…

MALICIOUS

PDF

40.2 KB Created: 2020-08-09 00:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cc22dc608f863fc4f9b7769fcb1fc40 SHA-1: 92ff71200c558b3ca6049bd484e604833bd2b5a9 SHA-256: 5c1feff5a37f04301844decd15bca90a918e81a03b3e0ddeaed33da9c727a585
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link suggest an attempt to lure users to malicious sites or distribute further malware.

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=administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+mo%25C3%25A7ambicana+pdf
    • http://files.reversac-traductions.com/uploads/1/3/1/3/131384070/nagikirona.pdf
    • http://files.brooksidegundogsllc.com/uploads/1/3/1/0/131070192/zoketezuwegaji.pdf
    • http://wobelixi.hotepseminars.com/uploads/1/3/0/9/130969723/fabef.pdf
    • http://files.chandlerspins.com/uploads/1/3/0/7/130775592/sunejexaxodese.pdf
    • http://komuripo.championsride.org/uploads/1/3/2/8/132816066/zojomuno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/rexroth_pneumatic_valves.pdf
    • https://cdn.shopify.com/s/files/1/0436/0152/6948/files/automation_engineer_cv.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/ctet_answer_key_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/56595417029.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/pezutud.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/56074986147.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/jotigarefiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/18835596942.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/borape.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/lekulasiwes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8063/8879/files/introduction_to_abnormal_child_and_adolescent_psychology_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7152/files/pamiginefiguvuguxojin.pdf
    • https://cdn.shopify.com/s/files/1/0439/7993/1806/files/alphabet_phontique_de_l_otan.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3773/files/critical_strike_portable.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_off000058b9.bin
62f4d15b629acc186096a0b6e078a02b45bebb5bba8fbd88a103f220c9250dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B9 6044 bytes
font_01_sfnt_off00006c1b.bin
a3e9f9116500f65ed1c95608147576dd38663f0f4a7350c15c0885a8130c4abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1B 12456 bytes

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