Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3fda5a41ef4a7e…

MALICIOUS

PDF

53.8 KB Created: 2020-07-22 15:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfe977c34e12527457961c581303c9f3 SHA-1: a5048f12a49f2b7228ea30d4d898b6e9aef94eaa SHA-256: ba3fda5a41ef4a7eae48c600fad3247a9d521016b54762b989a3d34b6b516a82
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, preventing a clear understanding of its intended lure, but the presence of the malicious redirector is a high-confidence indicator of malicious intent.

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/wb?keyword=books%20and%20authors%20for%20ssc%20cgl%202018%20pdf
    • http://files.speckaylighting.com/uploads/1/3/1/3/131397946/mexafuzuwobu.pdf
    • http://files.zeroinfections.org/uploads/1/3/0/7/130739120/zoxuxokek-naxazuxazo-rukemisi.pdf
    • http://files.teammascoutahorganization.com/uploads/1/3/0/7/130739456/de32b83f7b3e.pdf
    • http://files.mikesalsgiver.com/uploads/1/3/1/3/131379443/1378367.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/50639835979.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/71382851785.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musigusuwekun.pdf
    • https://wijelofa.files.wordpress.com/2020/07/wotefupujik.pdf
    • https://bifariki.files.wordpress.com/2020/06/58935948511.pdf
    • https://wupefosa.files.wordpress.com/2020/07/tagelisorubekixoluvel.pdf
    • https://nagivujopig.files.wordpress.com/2020/07/wufoxoderusoxog.pdf
    • https://jikizazona.files.wordpress.com/2020/06/jabapejonibidadezim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6980/0597/files/mimeresanexalow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/82810858878.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/87473654771.pdf
    • https://cdn.shopify.com/s/files/1/0436/4818/8569/files/nogigopexupadanet.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/89580319555.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gijamibumiji.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/moxuzajabusagoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/jepovaxufazelom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajafaliwufenosikem.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_off000092f3.bin
6789d02d6cc97f6529ae01515442082f954cda11d72a0bdb5879d59a80c99165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F3 5768 bytes
font_01_sfnt_off0000a68b.bin
6198f46349c55b10bda8d89d28320362f93a38bd6ec436c0cbfbca4dfc80c7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA68B 10156 bytes

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