Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1c757d944216f9…

MALICIOUS

PDF

38.6 KB Created: 2020-08-07 04:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258311a626de53986b36460f4c0ee756 SHA-1: 183328ad3695e68be80e4a91b3d9308025088ef4 SHA-256: bc1c757d944216f9d235774acfe7b058882e80ba3e544aa6f966d3fc955209a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'introduccion a la administracion publica argentina pdf' and the URL itself, suggesting a lure. The presence of a malicious redirector link strongly indicates an attempt to lead the user to a malicious site, likely for phishing or to download further malicious content. No scripts were extracted from this sample.

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=introduccion+a+la+administracion+publica+argentina+pdf
    • http://files.nkcecc.com/uploads/1/3/0/9/130969003/kiziwekovureniw.pdf
    • http://files.alplatocpadmore.com/uploads/1/3/0/8/130873828/tivejetili-setudow.pdf
    • http://wovek.rampantoutdoor.com/uploads/1/3/2/6/132682787/vexabeke-gasow.pdf
    • http://gipaba.thespringschurch.net/uploads/1/3/1/8/131871390/pifemawenot.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/62578043069.pdf
    • https://cdn.shopify.com/s/files/1/0437/1785/3335/files/reimei_no_arcana_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/36981196331.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/82729330718.pdf
    • https://cdn.shopify.com/s/files/1/0437/2581/5959/files/60037342223.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/wodajilazabezelajupunovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0434/4912/2983/files/vineluwadurivokilukito.pdf
    • https://cdn.shopify.com/s/files/1/0439/1786/9211/files/riturexosufejuxuzelaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/52261643189.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/auditor_fiscal_do_trabalho_edital.pdf
    • https://cdn.shopify.com/s/files/1/0435/3415/5928/files/clicker_heroes_highest_save.pdf
    • https://cdn.shopify.com/s/files/1/0436/0231/3373/files/simajibidaninawo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004802.bin
923102d20b814568e8051df0be260a4ef1260320c717ca7b63ee24820203f879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4802 5436 bytes
font_01_sfnt_off00005a56.bin
8b51ac0982421ab6b0cd5bb6850bdc2ea95a1f8100ccd2df8140392518714a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A56 10460 bytes
font_02_sfnt_off00007cca.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCA 4324 bytes

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