Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdb3efed8bb57d4…

MALICIOUS

PDF

43.0 KB Created: 2020-08-06 11:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: debd6d74a299be0d33c1239d57a0dbee SHA-1: e6b50510e68ada841c9d2f49c7744bae367ad59e SHA-256: dcdb3efed8bb57d4b8e804587b848edb12facefd6a72eb46992fc7631840d3b6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body and embedded links suggest a lure to download further content, likely malicious. The primary IOC is the redirector URL, which is used to obscure the final destination. No scripts were extracted from this sample.

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/pify?keyword=speak+english+with+vanessa+pdf
    • http://files.stickysweetcupcakes.com/uploads/1/3/1/8/131856121/3f5b17ca27cff8.pdf
    • http://files.pacificaires.org/uploads/1/3/0/7/130775336/beb6b70c8a37e6.pdf
    • http://files.elizabethhorton-newtonauthor.com/uploads/1/3/2/6/132683001/5e71f5c787.pdf
    • http://files.dragonflykarate.org/uploads/1/3/0/7/130739614/4790490.pdf
    • http://files.lizleyden.com/uploads/1/3/1/0/131071240/wamapitabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/1795496139.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdf
    • https://cdn.shopify.com/s/files/1/0448/2033/2705/files/curso_para_aprender_ingles_rapido.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/wasozewanujoxerow.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/jisijabudonelogel.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/6th_grade_history_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2289/files/39039690188.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/cat_416c_operators_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/tamafatakebalilo.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_off000069d6.bin
f6ea4dbce2fec2f9a4e0af58637fd91b88672d1fb208e0b0f1bf3359b35c1d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D6 5524 bytes
font_01_sfnt_off00007cc1.bin
f509c5e429789e4d1086dc84d3e494022e39ab4d9ae05bcfabc62366eb6530bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC1 10148 bytes