Malicious PDF — malware analysis report

Static analysis result for SHA-256 8300548ec1ac71e3…

MALICIOUS

PDF

59.2 KB Created: 2020-07-25 13:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c2476b70005c8a4bb56fcfb72d27e47 SHA-1: fb7846894736f2999a47d88334b2386ce3f15412 SHA-256: 8300548ec1ac71e32959c957ca53fcc64ea6d37377a717666d2c3f8c2d334482
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to external PDFs hosted on Shopify and other domains, suggesting a link farm for SEO manipulation. One critical heuristic indicates that a link within the PDF redirects to known malicious infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a campaign to drive traffic to malicious sites, 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.ru/wb?keyword=endocrine%20system%20worksheet%20key
    • http://files.michalbaranski.com/uploads/1/3/1/6/131606407/3514568.pdf
    • http://files.tregeek.com/uploads/1/3/1/3/131380889/zaxadizetabeluwab.pdf
    • http://files.martachaffee.com/uploads/1/3/0/8/130813416/de0133e790.pdf
    • http://files.lvsolidaridad.com/uploads/1/3/1/4/131408581/luvawunovaritoxelu.pdf
    • http://files.glsgroupllc.com/uploads/1/3/0/7/130776327/xupixovosebetek-lowakax-kejuwexuzi-navetube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/54792872008.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/sifigigevizatajevepeda.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/60712520634.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/bukepesapuvamusozejupasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/viwevidikuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/nuwas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/95227917691.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/83370950559.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/gapumolaziva.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/wefixiladuwuliba.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/84842810554.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/xiruwuzutaxima.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_off0000a944.bin
974527cf0f94eee5ecbcebb35053cb089f15f1b9fd3335798534ef3891dc9a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA944 4940 bytes
font_01_sfnt_off0000b9f8.bin
6d5192b9cae35d9e59a1f1328688bff8e29857760d32c6172c0811ea47cd7d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F8 10896 bytes

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