Malicious PDF — malware analysis report

Static analysis result for SHA-256 6611c8e397177472…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 08:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac90cc90276d1f675319024a8f4ccd9 SHA-1: 1b4bed2d41b878049315f46409780622916e6bc9 SHA-256: 6611c8e397177472debfcb8eb47750bcd864452422c0fe07e78fb889a05f3c0b
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'below knee amputation exercises' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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/wix?keyword=below+knee+amputation+exercises
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_cf0d6220e13d49c58033b74ce4b832b3.pdf
    • https://static.usrfiles.com/ugd/0a593f_e5d00f1747054855983a286536f3d256.pdf
    • https://static.usrfiles.com/ugd/5af86b_4be32b9c745c47389b2a86b312d6c54f.pdf
    • https://static.usrfiles.com/ugd/1f2646_6172e8921a7d4006a6c52ff394cdc674.pdf
    • https://static.usrfiles.com/ugd/b8c837_27e87ce0f6984bddb613b0fbd10ace6e.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_7c916b258617480a979f1a74fc861584.pdf
    • https://static.usrfiles.com/ugd/7d21c0_85fc063315394fe7aa804800731922de.pdf
    • https://static.usrfiles.com/ugd/5be868_091512b53e7b4b3bbbed3f1fd1d82e64.pdf
    • https://static.usrfiles.com/ugd/8ab72e_e0915b3380da4a56a29c5dffcfdec955.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/77892191374.pdf
    • https://cdn.shopify.com/s/files/1/0470/8732/1246/files/fofaxedez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/59452946437.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/66510446961.pdf
    • https://cdn.shopify.com/s/files/1/0438/7389/4555/files/checkbox_always_checked_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/61957538391.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_off00006101.bin
bf39347e2b278d4aede871e7b7830c51c19ce3fe6f28f76335dc04fd3bbf0bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6101 5232 bytes
font_01_sfnt_off000072c8.bin
c4d19d835e8a56e1d40a2d9962610f23f0ffa4a4ccbeb942150be7b6455cba0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C8 10076 bytes
font_02_sfnt_off00009532.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9532 4324 bytes

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