Malicious PDF — malware analysis report

Static analysis result for SHA-256 856a79c72c8d1b7c…

MALICIOUS

PDF

95.9 KB Created: 2020-07-30 03:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f095127e5550e5b02125bde9d44f76a SHA-1: 5b096e9db28d220a551a9ff12f47b5d0e24d2635 SHA-256: 856a79c72c8d1b7c7e001c33dd55729f4ed2645a1a4762e6fbdd8d2d5ec4e892
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains keywords like 'Missed abortion pdf' and 'wkhtmltopdf', suggesting a lure. The primary attack vector appears to be directing the user to malicious infrastructure via the embedded links.

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=missed+abortion+pdf
    • http://files.djsfitnessevolution.com/uploads/1/3/1/4/131408209/sikiperezutigimexus.pdf
    • http://files.pmawm.com/uploads/1/3/0/7/130738933/lesutubivutuwi_tekivegirole_gagujapodunen.pdf
    • http://files.mountaintrafficcircle.com/uploads/1/3/0/8/130814208/fopigedilowi-zixajeni.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/30927672770.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/xidesafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/64364295279.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0436/0952/2339/files/guwebukavagolimi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/xutawenuwosivefinenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3363/files/japuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/78001089878.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1613/files/wubakefajokadamur.pdf
    • https://cdn.shopify.com/s/files/1/0440/9557/0072/files/57239885959.pdf
    • https://cdn.shopify.com/s/files/1/0432/4330/7175/files/60536178115.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_off00013d3b.bin
d5ca33be3e6ba49882049f33175a0f3e907816c1e808727e91c80e4f6ac29758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3B 4936 bytes
font_01_sfnt_off00014e06.bin
c698856e8bd7153e7a8ff5988e631f82c2f1b5bcbbc8fb531d17dae4604c5980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 10488 bytes

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