Malicious PDF — malware analysis report

Static analysis result for SHA-256 299f94b65d4c53f4…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 15:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ab46d13f92572bfe8ee1a9b17bf459 SHA-1: ad8e076af204f7b7d64213f6fba0559c32b87085 SHA-256: 299f94b65d4c53f451334e345b31e6f18f55d5e5be0d09d52a21324151e799ca
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link to a known malicious domain, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though obfuscated, contains the primary malicious URL, suggesting it's the intended lure.

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/wb?keyword=shape%20attributes%20worksheet%20first%20grade
    • http://files.accountinglyceum.com/uploads/1/3/0/8/130813645/bujurotolaf-genopa.pdf
    • http://files.rotarygallop.com/uploads/1/3/0/7/130739227/pimugaderonufam-favozutumib-fixuvilonuj-rudifaz.pdf
    • http://ketaxak.luckylifebymeg.com/uploads/1/3/2/3/132303382/aa41ec.pdf
    • http://merujonu.aquaattack.net/uploads/1/3/1/6/131637649/jirufap_pivud.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/67566943957.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/calendario_lunar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6524/4832/files/14458289416.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/75303669779.pdf
    • https://cdn.shopify.com/s/files/1/0432/6195/2155/files/44963217043.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/44072264476.pdf
    • https://cdn.shopify.com/s/files/1/0436/4982/6969/files/baptism_in_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/gojinog.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/calidad_de_vida_laboral_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/maweratoselirixetivejebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4332/files/38120665383.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/lovemaretokibovipu.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_off00006214.bin
639ac69e690b74b8789db3cb492af3dbc3707627917a07e278d6abb0145e765e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6214 5668 bytes
font_01_sfnt_off00007563.bin
14ae5edc773e222be8c070620493d6f4db000048178f5e3cf1648ceb2dd34ace
pdf-font-stream PDF embedded font (sfnt) at offset 0x7563 9996 bytes