Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a19a346e69409a1…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 06:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec7224dbeaf47a1f2f198ded89a8a99e SHA-1: a87f0a932c30484668c0cd176fa26583f3aaa53e SHA-256: 6a19a346e69409a1c06c65e7d2f676aa101c044bf573fc76787674372d9300a1
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, forming a link farm, with a critical finding indicating one of these links leads to a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for downloading further content. The ML classifier strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=acquisitions+incorporated+d+d+pdf+download
    • http://files.stopglobalwarmingdaily.com/uploads/1/3/0/7/130739596/patunifi-zovivagujuvav.pdf
    • http://files.davidbuswell.com/uploads/1/3/2/7/132741169/sosipemusawa.pdf
    • http://files.burmantoftscommunityprojects.org/uploads/1/3/1/3/131383619/2f4687.pdf
    • http://files.operationhelpahero.org/uploads/1/3/1/8/131856358/41796.pdf
    • http://files.gruffcorn13.com/uploads/1/3/1/6/131637919/d453c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0434/4528/9127/files/xakulatakuxefevofalegi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/42937688593.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/rovekaroxowoxobida.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/27698541495.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/gajat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/2108553627.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/juwuwofifobege.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/63141837786.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000596c.bin
b3d7f68d9c79c6d2e4e4ac2023b6e5e52c0763cd3caf932c318103be2d2ecd30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596C 5236 bytes
font_01_sfnt_off00006b4e.bin
aded34aeb9861d10c37510a7e3d61de6f03cc514f5a2a93633f3baf399147ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4E 10584 bytes
font_02_sfnt_off00008f7a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7A 4324 bytes

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