Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f68a37c2ae758b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 04:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc4e05ba4839e416db12d9c090247026 SHA-1: 6c970ff3f1808468f954ca532e9663087045be39 SHA-256: c3f68a37c2ae758b53f01aa4eb76ad8775c10c1a2bc0b4aee213beb3dcc41c44
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=manor+park+primary+school+ofsted+report', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to a school report. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a broader campaign to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=manor+park+primary+school+ofsted+report
    • http://files.beneaththesurface337.com/uploads/1/3/1/3/131379301/f577ed02f44.pdf
    • https://reports.ofsted.gov
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/63153762532.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/68003019943.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/year_10_mathematics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/descargar_comic_asterix_y_obelix_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/bebetapinoxovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/81567420715.pdf
    • https://cdn.shopify.com/s/files/1/0431/2753/7828/files/pevuze.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/annuity_due_problems.pdf
    • https://cdn.shopify.com/s/files/1/0430/6652/3809/files/academic_writing_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/reactivity_of_aldehydes_and_ketones.pdf
    • https://cdn.shopify.com/s/files/1/0465/2030/3774/files/hd_streamz_apk_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/1236/5211/files/36667239086.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_off00006104.bin
ef0068f9935e3974bd6892988f5c67358b4be92f0798d8823604ac841397a90c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 5568 bytes
font_01_sfnt_off000073cc.bin
fe685f52bec086793e09ebbb35153a658297a3ca41941fa049e3acd2fd0fee60
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 10864 bytes