Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9c33a18f1d6568…

MALICIOUS

PDF

47.0 KB Created: 2020-07-29 04:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a9eada3ab034b96e5afb4fc80d06fc SHA-1: 22f8e5630831ffe4af904d628a4fb858c31d382b SHA-256: 5e9c33a18f1d65686098a7063563d0aa4b2c97190f5297f855e55f24f87954bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of link farms and a malicious redirector suggests an attempt to lead users to harmful content, likely for phishing or malware distribution.

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=glibenclamide+metformin+drug+study
    • http://files.macbma.net/uploads/1/3/1/0/131071312/cbaabbf0b5b.pdf
    • http://files.darvanadoulaservices.com/uploads/1/3/0/7/130775959/godujabu-gowesor-rizofokezopa.pdf
    • http://files.thesouthmillschurch.com/uploads/1/3/0/8/130814329/dulunomadomexevujidu.pdf
    • http://files.wellsburgchamber.com/uploads/1/3/1/0/131070327/zezotig_zenozusu_litukewur.pdf
    • http://files.tankuanaw.com/uploads/1/3/1/3/131379612/eda4253071.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5024/6048/files/wetomoganonulojof.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/rixiwosetozevali.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/7799072971.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/vemasu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2633/files/sowiduxebodixadozifosez.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4022/files/pifufozixeginixo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/77982053082.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/83822185981.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/sogufoguj.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/sunixazisefigimokapizajem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golalebilafofuzugetuvi.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_off00007965.bin
8e46b04f22dc215ca3161807173005ba6d0e74014b17bd96409962a3a7ec9dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 5496 bytes
font_01_sfnt_off00008c02.bin
26660c1eb9fed4bead134ad09f0be96b5391ce846cb4be179ae90e7597f80379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C02 10264 bytes

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