Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fc163fc82ce8d5…

MALICIOUS

PDF

41.9 KB Created: 2020-08-24 18:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9222d4fc7c6b1575593363c179e774 SHA-1: dc1c6371b3e81812d897f20bf629053b7449d896 SHA-256: 69fc163fc82ce8d56f91f8f8d2cc1afffa6a37d96850e5ee0946fbde546dfdf7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'doubles worksheet grade 2' and the malicious URL, suggesting a lure to disguise malicious intent. The presence of a large number of external PDF links further indicates a link farm or redirection strategy.

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=doubles+worksheet+grade+2
    • http://files.realisticwingtutorial.com/uploads/1/3/1/6/131607440/3a5dc4efa5.pdf
    • http://toforelu.catholicartistconnection.com/uploads/1/3/1/6/131636612/9087441.pdf
    • http://files.estherica.com/uploads/1/3/2/6/132682819/69e77d1a3a35994.pdf
    • http://files.judyireneharney.com/uploads/1/3/2/8/132814518/e73b3f.pdf
    • http://files.mpmasons.org/uploads/1/3/2/3/132302736/b66185354f42c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/menazixufeduso.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/55451475062.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/25614900053.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/blackbird_beatles_tab.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/date_format_iso_8601_z.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8074/files/16294729860.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/command_prompt_reference.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/holt_mcdougal_algebra_2_common_core_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/78384480874.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/vibeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/pharmaceutical_capsules_podczeck.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_off0000647c.bin
43210be6bebc3effdacc1d02567e596bf2fb7528338bb77356a40eef8dddb45d
pdf-font-stream PDF embedded font (sfnt) at offset 0x647C 5512 bytes
font_01_sfnt_off0000773d.bin
be6874786dd1e61dda19e7d166cb655d90dced85e057330f293371056b95c3c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 10364 bytes