Malicious PDF — malware analysis report

Static analysis result for SHA-256 61658cbe0e5d3dd4…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 12:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d5a276adb91a78b612672a30565e4be SHA-1: 23c38a94d1394c7aee7e30b0e49835269f40104a SHA-256: 61658cbe0e5d3dd4f8611829f15761ce8385d51ccc1beaec64658f8ce7f6f8a5
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.com/wix?keyword=alcanos+ejercicios+resueltos+pdf'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or malware distribution attempt.

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=alcanos+ejercicios+resueltos+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/management_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0458/6419/0105/files/college_decline_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8770/files/gixewixetisedabo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4240/4512/files/mufe_hd_foundation_shade_guide.pdf
    • https://static.usrfiles.com/ugd/7c3584_8377c28ffc6345a7a323c4d9fc909233.pdf
    • https://static.usrfiles.com/ugd/79e0dc_fb90f44f48524bf09c7d1d6e43a7e442.pdf
    • https://static.usrfiles.com/ugd/b8c837_6dec77c6d46b470ea3f56922e1c7dda0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffb192fea79f455997aa342fe78ed78c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8db61c4f5e14e4f851e78469309912c.pdf
    • https://static.usrfiles.com/ugd/b8c837_da74cf5d45ab41b8ba8732aa2e56ac45.pdf
    • https://static.usrfiles.com/ugd/b8c837_32d0e5eec7444aec95b8c0c306ace257.pdf
    • https://static.usrfiles.com/ugd/cf14a4_1804e7d57ad748f298d80bea829b9f11.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0c235dfc35946d0a1b74cd1f9022525.pdf
    • https://cdn.shopify.com/s/files/1/0468/9965/8914/files/israel_kamakawiwo27ole_somewhere_over_the_rainbow_what_a_wonderful_world_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0463/2038/6205/files/nationalist_movement_in_west_africa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/telugu_bible_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/xoxebimexosurib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/curso_de_violao_completo_em.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_off00005ddd.bin
d7c5e38c9d9b48d14c9ac7b5eae6cf0ac12ae8b0fc5a867ef8ea4caebe6af379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDD 5096 bytes
font_01_sfnt_off00006f3a.bin
c3e3ff9b20f112458f23fac1440171109ac8a1b94564078d0752f185c4758f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 11020 bytes
font_02_sfnt_off000092f1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F1 4324 bytes

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