Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05c82d267bffe7e…

MALICIOUS

PDF

48.1 KB Created: 2020-07-12 23:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1f279842dfac0b3ba9ed6ea2ea2ecd SHA-1: 303737ff701bcfde1d6ae7a08ab6768233fbbabd SHA-256: a05c82d267bffe7e6517c4dbecd3eff98d47bb51472d3b9b76d841bf48e58292
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'unemployment problems and solutions'. The primary attack pattern involves redirecting users to malicious infrastructure via these embedded links.

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=unemployment%20problems%20and%20solutions%20pdf
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdf
    • http://files.evanburgerportfolio.com/uploads/1/3/1/0/131070146/9bed5d4.pdf
    • http://files.lindathurd.com/uploads/1/3/0/7/130775053/gusisinox.pdf
    • http://files.graceub.com/uploads/1/3/2/6/132681404/6733747.pdf
    • http://files.nejnamc.org/uploads/1/3/1/6/131607346/bujowadatasivo.pdf
    • https://getaxigafinu.files.wordpress
    • https://sizatasuxam.files.wordpress.com/2020/06/68138953876.pdf
    • https://zukibokukiki.files.wordpress.com/2020/06/povuzubazume.pdf
    • https://xifabufuvari.files.wordpress.com/2020/06/pomugipa.pdf
    • https://getaxigafinu.files.wordpress.com/2020/06/rifajitera.pdf
    • https://wogikasu.files.wordpress.com/2020/07/90125306971.pdf
    • https://kepupigokir.files.wordpress.com/2020/07/setix.pdf
    • https://wagijewak.files.wordpress.com/2020/07/dilutavor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xorufolikuvuzinekotawoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/kosibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/badomoxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/zafinagatamajiwemaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/xataruxepifun.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/9368128565.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2457/files/11688453697.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cbe.bin
3408a5f0c964f5e9e69d84218efb7a1ed6bf965e64b0e9cc6d127af9c69c8f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBE 5300 bytes
font_01_sfnt_off00008e9b.bin
884c0fbb1eb8ddf590a571c3567110e7a1bc99db73f8ed277923142492b3ef13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9B 10624 bytes

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