Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3dc5af925d6a46…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 19:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8a63b2ac76638dcabf29311aa95883 SHA-1: 5a96ca48aa70c4f7fe99e302cc9d5c9142283451 SHA-256: 6f3dc5af925d6a46b4631f0622de52ab47e210a8c9aeb73d48c67217e2955656
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to 'abc tracing printable worksheets', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to 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.ru/wb?keyword=abc%20tracing%20printable%20worksheets
    • http://files.12chemistry.com/uploads/1/3/0/7/130739143/novutejizikojekuv.pdf
    • http://files.slosymposium.org/uploads/1/3/0/7/130739369/pibabulibogo.pdf
    • http://files.sebastiancurrier.com/uploads/1/3/0/7/130740571/7755106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/e-_40_my_ghetto_report_card.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/wuwer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/animals_maroon_5_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/69583893186.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/togadesiwukog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2131/1898/files/74268886635.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/1697610765.pdf
    • https://cdn.shopify.com/s/files/1/0435/7632/8355/files/jaxex.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/metabolic_acidosis_in_ckd.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/9352868121.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_off0000629b.bin
cf7f885e026dc86a4c6ccc7c397cfdc76e81dc8fb72e5f9d3244330dc9bcfe08
pdf-font-stream PDF embedded font (sfnt) at offset 0x629B 5480 bytes
font_01_sfnt_off00007540.bin
b7790159bb3ae90e167170ab7dbdea54b47a167c0d9f505301ab22663d2ce774
pdf-font-stream PDF embedded font (sfnt) at offset 0x7540 10328 bytes