Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b03e72a115d515a…

MALICIOUS

PDF

49.5 KB Created: 2020-08-08 23:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcafa35673b99f2c503c5be677642fc5 SHA-1: 972c4807566bbc1ebb2a75629b6dd5f0312eca56 SHA-256: 7b03e72a115d515aa4521e1341f1de6db886c2be40b949f618d4d46d02d5d942
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service that is known to host malicious content. The document body itself contains text related to downloading a PDF, and the embedded links likely serve as a lure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=business+communication+today+11th+edition+pdf+free+download
    • http://files.mtvfc2.com/uploads/1/3/0/8/130874007/vitis_pubafi_wazone.pdf
    • http://faviritir.sallydavisstudio.com/uploads/1/3/1/8/131871699/xezisibanufa-mafivakewa.pdf
    • http://files.faiths-boutique.com/uploads/1/3/0/7/130739212/8710948.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/65209584580.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/xitasivalaxomis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9185/3479/files/90626094322.pdf
    • https://cdn.shopify.com/s/files/1/0428/5703/7990/files/printable_basic_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/39138479090.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/40232385724.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/dolesavulefesan.pdf
    • https://cdn.shopify.com/s/files/1/0437/8371/7015/files/55890733225.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/47112413071.pdf
    • https://cdn.shopify.com/s/files/1/0429/3001/2316/files/pudigekavasuwegun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62654677968.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007460.bin
9a4e3db7fef7c9d43ca7f2cee2410f82a153a01d823eecfc6019ebc0099f4534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7460 5572 bytes
font_01_sfnt_off00008732.bin
3b5346b2e3bf3d7f65382bdadce9bf0ae86ce58fdb2a1d0e80b36fd908db1c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8732 10368 bytes
font_02_sfnt_off0000aa9a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA9A 4324 bytes

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