Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6826688fea940ef…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 15:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f877c47895ad62233b69c77e05354466 SHA-1: 8f349cdfb09fd956ad01a4034f67d9de24ed81e8 SHA-256: e6826688fea940ef22904f33c5ddc962be715e04a5a750ea5d92b1410972d8e2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=intolerancia+alimentaria+definicion+pdf'. The document body, though heavily obfuscated, contains text related to 'Intolerancia alimentaria', suggesting a lure to disguise the malicious intent. 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/wix?keyword=intolerancia+alimentaria+definicion+pdf
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/51184339138.pdf
    • https://cdn.shopify.com/s/files/1/0446/9299/6252/files/list_of_eponymously_named_medical_signs.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/bafufelavifipudavegivi.pdf
    • https://static.usrfiles.com/ugd/c3f88d_f01c78e001e146e188904ea1ea391afe.pdf
    • https://static.usrfiles.com/ugd/33a2e4_c4e4c158a57045b28aad27f01c026ff7.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/97615710418.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/xigomitazetanamavabapuno.pdf
    • https://cdn.shopify.com/s/files/1/0439/1557/5464/files/20583353196.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7807bcadfb849dea0642997cd7616ff.pdf
    • https://static.usrfiles.com/ugd/ddb60a_66c0736b698b4f01be23a1406f62bbdb.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_off00005e88.bin
2e91b8f88a0a6bfb5518d8c3314896c4c1a4612ff54ace0d1bb8dc846fa23a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E88 5060 bytes
font_01_sfnt_off00006fa6.bin
744e0c39c46cdb7f9ebbb19aba4d881f8a672bf54f1ebc32bbf6327b4f46ab8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA6 10568 bytes

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