Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec6c056cab1d78e…

MALICIOUS

PDF

46.7 KB Created: 2020-08-29 22:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1034d27ebbf9893a467eefff8c39fe68 SHA-1: fa73abbc706e5a4e0b8f7b31eec2932e59f208ae SHA-256: eec6c056cab1d78e169e789a213a87cb6afa36f8b809b3de70e6569767bf6e44
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.com/wix?keyword=idalberto+chiavenato+introducci%25C3%25B3n+a, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify links, suggesting a lure to academic or technical content to mask the malicious redirection. 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=idalberto+chiavenato+introducci%25C3%25B3n+a
    • https://cdn.shopify.com/s/files/1/0434/7920/3992/files/sort_arraylist_using_comparator_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/megudibiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/12630402266.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/biggest_cities_in_louisiana.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/66284465807.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fce968bc6d148248bcbe46025e23ace.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_a9a774c9a44a43cda0b6d0e2ba4689e4.pdf
    • https://static.usrfiles.com/ugd/837d34_f2442d6da390408799176f6b8f85661b.pdf
    • https://static.usrfiles.com/ugd/b8c837_824834d97be84c3589c608d1eae0b7e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae5f892deb4240efa3521ac7d198d0d3.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/xudulevaxedivokorurojot.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/81781377614.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
    • https://static.usrfiles.com/ugd/e32576_67572dd3bf0e4f31bd06212b3fae98e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d17db36ffd7a4e5c8cbb7c4f97faa918.pdf
    • https://static.usrfiles.com/ugd/cf14a4_29e5b4ff045e49a9b0e449405560d04d.pdf
    • https://static.usrfiles.com/ugd/b8c837_04b691418b70453aa3f836a0939145b7.pdf
    • https://static.usrfiles.com/ugd/a76634_ec3e70a1a27640bfb088d8bbccb0eabd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b4.bin
cbb703d36ae8146dd15b1829c5f6099ca5a2fcfa313ae21d1836c104abc14a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B4 5004 bytes
font_01_sfnt_off00007a6a.bin
6c40555c6149f512458d269b7e46331c26d5cf86d58a1afbc951c9712ca87e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 10692 bytes
font_02_sfnt_off00009d40.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D40 4324 bytes

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