Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ffc18f58915132…

MALICIOUS

PDF

40.7 KB Created: 2020-09-16 21:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0174aa71c48d6df1561f44c2390bc68f SHA-1: 9e9053c89f44c4b3f87de9e88443d66cb47a0e6e SHA-256: 65ffc18f589151323b3e132296b2d0cca81edd3f99e87a4950eaec17c85c4795
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are algorithmically generated and point to other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, which is used here with a job search keyword to likely trick users into clicking. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics suggest a phishing lure leading to further malicious content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.link/wix?keyword=evergreen+school+district+jobs+vancouver+wa
    • http://jijevi.paytonpropertyservicesllc.com/uploads/1/3/1/6/131637719/6581158.pdf
    • http://xakofaxis.asasmy.com/uploads/1/3/2/7/132740214/91556.pdf
    • http://dataru.reachatweec.org/uploads/1/3/2/6/132682124/tibubin.pdf
    • http://rofizeb.4seasonsglobal.com/uploads/1/3/1/4/131453943/ludubusamebasol-dujefotege-foxobedadaf.pdf
    • http://napojevew.catholicfamilybootcamp.com/uploads/1/3/0/9/130969430/sularixi-pilutatavupe.pdf
    • http://xuzutaro.northeastminneapoliselectrician.com/uploads/1/3/1/4/131483068/86256.pdf
    • http://files.carolinashowcasebaseball.com/uploads/1/3/0/7/130740325/xugufigexova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/womedufekizegirefinufoni.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/alelopatia_positiva_y_negativa.pdf
    • https://6c0a4505-6954-4b74-81af-1b3127721675.filesusr.com/ugd/668a47_411eb8746e174cb1a5deb65feaae35be.pdf?index=true
    • https://d46e5383-1ad7-4bac-96fa-56da8dc3efd4.filesusr.com/ugd/c0fca2_131d719c7e1e4382ae9536751af2b25e.pdf?index=true
    • https://9cfc6593-f043-487e-818a-12972c145587.filesusr.com/ugd/8db125_cc761a2b12db465da220f786a1ec7573.pdf?index=true
    • https://9766ec13-8caa-4e39-9ff8-2198f21892b5.filesusr.com/ugd/9ea91e_ad1740dc39b947b1a72992723fffa1a8.pdf?index=true
    • 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_off00005e83.bin
6dc89298d462b2917e1773ca69302da2d2e610e847a459c04524a4d2cc5f01bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E83 5528 bytes
font_01_sfnt_off00007165.bin
8541f2ad9a61e5f913f4acab6ade1a15dad27091624d27a63ff857b6f3dcb06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7165 10632 bytes

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