Malicious PDF — malware analysis report

Static analysis result for SHA-256 70887ccf08f36afb…

MALICIOUS

PDF

39.8 KB Created: 2020-08-13 15:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05fd851864fc60d8d63b40318d896d75 SHA-1: e06c71178c29d2922cc860c57ee4f57fa9679c4b SHA-256: 70887ccf08f36afba5fc580f65b53cd2c3b93c19968a5186421b33e921b7daaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to drive traffic to malicious sites, potentially for phishing or SEO spam.

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=gazeta+mapo+pdf
    • http://files.gritiyacctv.com/uploads/1/3/1/6/131606502/nadujexokife.pdf
    • http://files.phidecatheta.com/uploads/1/3/0/9/130970014/matoganojesi.pdf
    • http://wizir.menonlyadventures.com/uploads/1/3/2/7/132712615/5594135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/weroson.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/sewov.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/52721825740.pdf
    • https://cdn.shopify.com/s/files/1/0430/4781/3269/files/rixaxofopon.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/jilumujuparopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9899/6889/files/gixadetigudede.pdf
    • https://cdn.shopify.com/s/files/1/0439/8258/6014/files/19439664049.pdf
    • https://cdn.shopify.com/s/files/1/0435/4139/7656/files/what_happened_to_the_ancient_library_of_alexandria.pdf
    • https://cdn.shopify.com/s/files/1/0447/1151/0170/files/diagnostico_cancer_de_esofago.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/anatomy_of_pharynx_and_larynx.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/electric_fence_7_days_to_die.pdf
    • https://cdn.shopify.com/s/files/1/0448/1181/3015/files/metodos_anticonceptivos_medicina.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_off00005c17.bin
9580725a54f7412ac75918f98b254e97e5de36f21cbbbdd142359e7a34561409
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C17 4964 bytes
font_01_sfnt_off00006d00.bin
d7380a0ce0e8a258cc22c196f1428e46d9ca4f40ca7a735f98aafeffa772708b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D00 11584 bytes