Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a046a811779e7d…

MALICIOUS

PDF

42.8 KB Created: 2020-08-04 03:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a19deb3644b599ee67a6fd72c62a81b3 SHA-1: 388425319518478e50c3fde6161b092494bbd719 SHA-256: 18a046a811779e7d45abd22e0f513ba03d285a05b2c0ffb86743ad326adf985b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one primary link to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to lure users into downloading potentially malicious content. The ML classifier also strongly indicated maliciousness.

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=building+construction+by+rangwala+pdf+free+download
    • http://files.pavlicek-foto.com/uploads/1/3/0/9/130969565/sirejifora.pdf
    • http://files.jyothischool.com/uploads/1/3/0/7/130775025/zomurumub-wamuxupipod-vudum.pdf
    • http://files.bluestarrichmond.org/uploads/1/3/1/6/131606465/a700bef9eb.pdf
    • http://bowojoto.studio-aegis.com/uploads/1/3/1/6/131606289/kegitogipumejox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/devuxadutaxezig.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/11520170413.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/93393076220.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6284/files/87669098440.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/panisigofinore.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/forimaruwaluxedukiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/61832734856.pdf
    • https://cdn.shopify.com/s/files/1/0428/7456/8860/files/polobezitodowikugaxitisu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/entrepreneurship_hisrich.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/92884725126.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/podixotesagajaki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005690.bin
ad196ff5f4d296ec210c1b96169e1aecfe0b87b654daa0f6b02d9d84a8a7f595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5690 5708 bytes
font_01_sfnt_off00006a1a.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1A 2116 bytes
font_02_sfnt_off000073e4.bin
4a0e3be08447e441074bef203fac4383c9f127edf6281542d9d8888547756738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E4 12940 bytes

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