Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c3b8502a259d44…

MALICIOUS

PDF

44.4 KB Created: 2020-08-25 04:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ec6cfc623f3f7bafaaf65907b5b66f SHA-1: b545643fb9272dbd4fb40b6df39d7730a0947d6d SHA-256: 73c3b8502a259d44b9865fd44296f5db77493ddaf993bfdc8b396b9bb23ea107
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector to malicious infrastructure. The document body, though partially corrupted, suggests a lure related to a 'Microsoft project plan excel template'. The presence of a link farm and a high ML classifier score further support malicious intent. The primary IOC is the redirector URL, which is likely used to serve further malicious content.

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.cc/pify?keyword=microsoft+project+plan+excel+template
    • http://files.livingstonemasons.com/uploads/1/3/0/7/130775862/kemugapomuk-gemifimekok-tutidenasogoka-kipefazolupe.pdf
    • http://files.opstrategyllc.com/uploads/1/3/1/8/131856545/7453991.pdf
    • http://gutikuru.guidancebylori.org/uploads/1/3/1/6/131637836/venaziduxidata_gibigobu_mosiropir_naxotiwoda.pdf
    • http://kupad.optimumgolfstore.com/uploads/1/3/2/6/132680813/1306626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3414/0072/files/66174994144.pdf
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/ruvamasesexekesufimefe.pdf
    • https://cdn.shopify.com/s/files/1/0447/9424/9377/files/name_reactions_in_organic_chemistry_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/95850620187.pdf
    • https://cdn.shopify.com/s/files/1/0431/1796/9570/files/41432211573.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/58208720400.pdf
    • https://cdn.shopify.com/s/files/1/0454/3139/0364/files/mirumezivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/sorusixuvig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/asset_management_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/seventh_day_adventist_elders_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2662/files/amitav_ghosh_the_hungry_tide.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0726/files/felugalizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/hydroxyapatite_properties.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_off00006fa0.bin
2f4ceff4eda5197f36d5770318333edf6b812fa0fe66d713cc2969876845004d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA0 5312 bytes
font_01_sfnt_off000081a7.bin
17bd3f351e8598eaa7ec24624724dce23a5c906a56d2c0d05c08d2589004e684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 10104 bytes

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