Malicious PDF — malware analysis report

Static analysis result for SHA-256 672c670bb2e4c9b4…

MALICIOUS

PDF

42.7 KB Created: 2020-08-28 13:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00f419223ad848d2f4a1858e4af57b27 SHA-1: e2b5532498b3a0a8698131f23326ce1e109b74fb SHA-256: 672c670bb2e4c9b424c91aa391405fc19f91225e9d908823735911bc4aae9f35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=wallpaper+the+last+of+us', suggesting a lure for malicious content. 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.com/pify?keyword=wallpaper+the+last+of+us
    • http://satewe.writinginorganisations.uk/uploads/1/3/2/6/132683051/jujazuronad-sozetuke-zodutudugan-sejujosijemof.pdf
    • http://files.maywoodkennels.com/uploads/1/3/1/3/131380745/fed2436795b5602.pdf
    • http://files.energiepositief.info/uploads/1/3/2/7/132712508/gofebopepapepu_fakedefu_pelemebasorug.pdf
    • http://files.firststopwindows.com/uploads/1/3/1/0/131070080/volodirofazoroz.pdf
    • http://files.peoplesmovementofpakistan.org/uploads/1/3/2/6/132681409/2512761.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/windows_usb_dvd_download_tool.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/99761064664.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/rojorijokobimugukojivakid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/fexevinanirapaperofifam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7767/2868/files/migibewobifisifamolagifi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/xuxidovud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/73433344157.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/rpf_ancillary_answer_key_2019_group_b.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/jovalobetosizegix.pdf
    • https://cdn.shopify.com/s/files/1/0453/2715/5355/files/pizonexew.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/77353300292.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/ritiged.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.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_off00005c6f.bin
815691a29111eb145359803a2a8e5923ebf2e3f1f8d12a17c508f46ff35baebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6F 4732 bytes
font_01_sfnt_off00006caa.bin
2653e98ed6a5a4e9ad886be4fe3e62857e2c0c49236389a058d31789fb42ae54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAA 10356 bytes
font_02_sfnt_off00008fd9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD9 4324 bytes

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