Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea6972f24f0e311…

MALICIOUS

PDF

39.2 KB Created: 2020-08-19 08:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9272195c53e62e35cc18311d3c55a89 SHA-1: b3da45ace1dd25b2140bc2a507fff4e5c7c22f2e SHA-256: 7ea6972f24f0e31163781742fba4b0440fdcd9bd8477d0317b347297766eb91c
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to SEO-optimized PDF documents hosted on Shopify. One of the primary links directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains keywords related to 'hourly schedule template excel' and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=hourly+schedule+template+excel
    • http://files.carlascoachingforhealth.com/uploads/1/3/0/9/130969712/legoxira-jupimadelotudep-wuburegituda.pdf
    • http://files.saltnantucket.com/uploads/1/3/0/7/130775191/e4f802f7.pdf
    • http://kozudino.mentalhiccups.com/uploads/1/3/1/4/131437605/deroripovodunek.pdf
    • http://febotojuv.wanderingrae.com/uploads/1/3/0/8/130814328/2629034.pdf
    • https://cdn.shopify.com/s/files/1/0440/2901/8262/files/jurnal_participatory_action_research.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/peter_pan_bedtime_story.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/jokizujuwowegufuziwimexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/banizexenogilesigedumizon.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/38226356392.pdf
    • https://cdn.shopify.com/s/files/1/0437/6454/7741/files/jamajota.pdf
    • https://cdn.shopify.com/s/files/1/0448/1361/5264/files/caller_id_location_tracker.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/zutirijegujon.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_off00005e0e.bin
ad42560cc2367ae671e76da862f736a32c7ca4e489c3ad70546742edbec14084
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0E 5444 bytes
font_01_sfnt_off00007076.bin
fd21dc6947ee7b068bb611ef8ee68b41b53ae5270fc708a0bf589b06e7109380
pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 9300 bytes