Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a88d5947058cbb…

MALICIOUS

PDF

46.8 KB Created: 2020-09-09 06:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 826f0c66b1f27326e445d4790dded00b SHA-1: f70e731bc2ef91011416b55e07b61a053087045d SHA-256: 65a88d5947058cbbefba2898cfc0c7d5325bceabab43b87989e54482aae3d320
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by multiple heuristics, including a critical alert for a redirector link to 'ttraff.club'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to university admissions forms. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.club/wix?keyword=ambrose+alli+university+ekpoma+post+utme+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/the_flash_barry_allen_comics.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/jisik.pdf
    • https://cdn.shopify.com/s/files/1/0438/5928/0022/files/51920899132.pdf
    • https://cdn.shopify.com/s/files/1/0436/0581/9555/files/42220648828.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4955/files/mathematics_pedagogy_questions.pdf
    • https://static.usrfiles.com/ugd/7baf93_95a277490c7e497da22a72a93efb3de5.pdf
    • https://static.usrfiles.com/ugd/e3834b_b253c2def2914e95a3f4fbdfb1bf0df6.pdf
    • https://static.usrfiles.com/ugd/4725f1_354bc297e62449e0ac7102e1bba8ba81.pdf
    • https://static.usrfiles.com/ugd/7a13df_fa9e92fdfc954fca9848109b121d1bcf.pdf
    • https://static.usrfiles.com/ugd/285be4_4d4a20c3a2114c73a14aaded73e191bb.pdf
    • https://static.usrfiles.com/ugd/2c7c49_d4ff5aee07274a7fb6e0b081a8436595.pdf
    • https://static.usrfiles.com/ugd/2486b5_afc56a253cb94120aa4a393fa5860f52.pdf
    • https://static.usrfiles.com/ugd/83f04e_06831193c4934f53a178a0d7febb663b.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/zexiretiditomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7594/4091/files/secondary_amides_chemguide.pdf
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/luwoneradebus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/sevidiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.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_off00006ac9.bin
cdabc9b1d3ba1d8a3154150b7dff62c26a2ff21d290224f3e982c8433ee381c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC9 5284 bytes
font_01_sfnt_off00007cb1.bin
0a2405d91e0f7e96b9944c14e6b2870fe4d5cd3927a08eada432b15a1a611ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB1 10012 bytes
font_02_sfnt_off00009f06.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F06 4324 bytes

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