Malicious PDF — malware analysis report

Static analysis result for SHA-256 9700444371bc7df3…

MALICIOUS

PDF

46.4 KB Created: 2020-08-09 05:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f65379718d18202a822a9cde6fd94b07 SHA-1: 43cf2e77dd9f405ab5f206359a9e80bc7d9dd0a4 SHA-256: 9700444371bc7df31d92f67e484607f64c32394277cd8da8b186ad25b3451071
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector infrastructure. The document body text and embedded links suggest a lure to download further content, likely malicious, under the guise of a resume. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=chartered+accountant+resume+pdf
    • http://files.mryanki.com/uploads/1/3/1/4/131406075/948963.pdf
    • http://files.peterboroughtempleband.com/uploads/1/3/1/1/131164250/4242959.pdf
    • http://files.heartpieces.net/uploads/1/3/1/3/131379749/3776242.pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • https://cdn.shopify.com/s/files/1/0429/4436/4710/files/pujunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/xerometiguwetakabizaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/ribokaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/91077076185.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4477/files/nimabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5625/7441/files/luvurutoximalelibez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/23291256142.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/native_american_flute_plans.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/fapenokujowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8642/files/18473890235.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/kutijuwofinebafalokarota.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/kulolusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3232/files/lidasiwawanorofedato.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699b.bin
496cee92cff8794b3b8c32707a7d1f2c8cc8dd5de7b558bb078bd421e5b58a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 5220 bytes
font_01_sfnt_off00007b27.bin
86fb1125a2a231b6b0c8fe0d76665d85d9c9f0062d37db8e9d28d0a7faa5061f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B27 10092 bytes
font_02_sfnt_off00009dba.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBA 4324 bytes

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