Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4453e05edcf43c…

MALICIOUS

PDF

40.1 KB Created: 2020-08-13 22:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79ec778d4c016854f30c3374d679246 SHA-1: 6af1bef27fdca681750d6b1bce11b47141b35298 SHA-256: 9f4453e05edcf43c92a5becb9e53d3d9391ea65150c0d4be343b087014ecaf71
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic identifying a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites. The primary attack pattern involves directing users to potentially harmful content through a deceptive link structure.

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=shield+tablet+k1+android+oreo
    • http://xeketad.dominiquecheylise.com/uploads/1/3/0/7/130739430/407072.pdf
    • http://pafusos.galceranartandfilm.com/uploads/1/3/0/7/130775607/lesiw.pdf
    • http://files.newhomeinspectors.net/uploads/1/3/0/7/130775196/vesigutef.pdf
    • http://files.usminiaturehorses.com/uploads/1/3/1/4/131437941/debofakudisetig-peviwenelof.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/67686760974.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3095/files/cee_lo_green_height.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/49040244272.pdf
    • https://cdn.shopify.com/s/files/1/0439/1695/1704/files/harmonized_system_codes_hs_code.pdf
    • https://cdn.shopify.com/s/files/1/0440/2046/5829/files/jefuzatokexejisifage.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/domejadokokenafovilafesov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/monster_aileen_wuornos_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/convotherm_combi_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/31050999071.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/20206098106.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/what_is_a_rhyming_couplet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1c.bin
88824d5c9406b79b1c42b14bb3dcc17850d56de235bcc5415a1b46ca0e16dcc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 5096 bytes
font_01_sfnt_off0000705f.bin
18319754022837cebdbfce1cbc562eb503842ecf3b9dc8ad65dbdbb82b8add9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705F 10332 bytes

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