Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffce3547f4778bc…

MALICIOUS

PDF

43.2 KB Created: 2020-08-21 15:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8909e66ce53e1c4cec33dd157ff9692a SHA-1: 2a2aadf1978027a517855eeec81dec13f6c9f1d8 SHA-256: 6ffce3547f4778bc88ec7e4cbf17283004de9825037ec454b91b43f20838b083
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate academic resources but ultimately redirect to a known malicious domain (ttraff.ru). This technique is commonly used for SEO poisoning and phishing campaigns to drive traffic to malicious sites. 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.ru/pify?keyword=logical+reasoning+in+mathematics+pdf
    • http://xojevax.livingstoncenter.org/uploads/1/3/1/1/131163725/c9fb30b23a467.pdf
    • http://files.katlarsondesigns.com/uploads/1/3/0/8/130874379/6225731.pdf
    • http://napas.flyajetsim.com/uploads/1/3/0/9/130969690/sagivi.pdf
    • http://files.strategyadt.com/uploads/1/3/0/7/130775465/9daaea5c7a111c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4062/8118/files/worizubewezanosimemojudez.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/equal_arm_balance_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/gafivegukezul.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/install_postman_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/65387411458.pdf
    • https://cdn.shopify.com/s/files/1/0435/5322/6913/files/komimawukapejesawobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3077/3913/files/wonajosejefib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/picsart_old_version_5._33._3_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/48310205415.pdf
    • https://cdn.shopify.com/s/files/1/0434/3309/9430/files/rcog_guidelines_for_blood_transfusion_in_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/honeywell_air_purifier_manual_50250.pdf
    • https://cdn.shopify.com/s/files/1/0433/4734/5573/files/dujelanakawa.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_off000068da.bin
dc81123e182c3163f11d05bd5e197d7afdfc6c029f3317c9258c36fa1b6717f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DA 5508 bytes
font_01_sfnt_off00007b6b.bin
825b11f3bac1c1ce9c202d5db2a87770d82e6c6a070caaae72510ea14cd5f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6B 10636 bytes

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