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) First seen: 2020-09-04
MD5: 5c2476b70005c8a4bb56fcfb72d27e47 SHA-1: fb7846894736f2999a47d88334b2386ce3f15412 SHA-256: 8300548ec1ac71e32959c957ca53fcc64ea6d37377a717666d2c3f8c2d334482
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of an SEO link farm. The primary redirector URL, https://ttraff.ru/wb?keyword=endocrine%20system%20worksheet%20key, is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'endocrine system worksheet key', indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.michalbaranski.com/uploads/1/3/1/6/131606407/3514568.pdfIn PDF document text
    • http://files.tregeek.com/uploads/1/3/1/3/131380889/zaxadizetabeluwab.pdfIn PDF document text
    • http://files.martachaffee.com/uploads/1/3/0/8/130813416/de0133e790.pdfIn PDF document text
    • http://files.lvsolidaridad.com/uploads/1/3/1/4/131408581/luvawunovaritoxelu.pdfIn PDF document text
    • http://files.glsgroupllc.com/uploads/1/3/0/7/130776327/xupixovosebetek-lowakax-kejuwexuzi-navetube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/54792872008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/sifigigevizatajevepeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/60712520634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/bukepesapuvamusozejupasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/viwevidikuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/nuwas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/95227917691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/83370950559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/gapumolaziva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/wefixiladuwuliba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/84842810554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/xiruwuzutaxima.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA944 4940 bytes
SHA-256: 974527cf0f94eee5ecbcebb35053cb089f15f1b9fd3335798534ef3891dc9a05
font_01_sfnt_off0000b9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F8 10896 bytes
SHA-256: 6d5192b9cae35d9e59a1f1328688bff8e29857760d32c6172c0811ea47cd7d6e

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