Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e6f9288b234b44…

MALICIOUS

PDF

72.5 KB Created: 2020-09-02 12:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2cf27b7b6fb7c8078b45e88c0d3a2df SHA-1: d9bd327d768474c1109e3f70e0b8a9adb109be65 SHA-256: 05e6f9288b234b44f0c3f8efb763de1fe8cf9dc6a6e28ed9662a5ae09ff0b163
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, indicating a link farm. One of the primary URLs, 'https://ttraff.ru/wix?keyword=cell+parts+and+their+functions+worksheet+answers', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious URL and the link farm structure strongly suggest a phishing or SEO poisoning attack.

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.ru/wix?keyword=cell+parts+and+their+functions+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1be480_d165a3e03f8b494382660c8e3f1b0d4a.pdf
    • https://static.usrfiles.com/ugd/0a0016_c7d24ba211cb4c7fa905934e113c8f1e.pdf
    • https://static.usrfiles.com/ugd/afe78f_2f1f70dff8e64cc9a455b05c79b00225.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_8af25043bd5c4abca618504f4a7e4c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89481e684a14465a2f29f9b678df186.pdf
    • https://static.usrfiles.com/ugd/963627_af8d1d22d7fc46ea9caa931c5aaeb7c3.pdf
    • https://static.usrfiles.com/ugd/39cb9d_4888d36c48e3482481f928d3a20f439e.pdf
    • https://static.usrfiles.com/ugd/b96e41_8af77ee0c4954b8b9c98430de5f64113.pdf
    • https://static.usrfiles.com/ugd/2ac701_5aedf950269a4d87a5dbb0bc7f4a86c3.pdf
    • https://static.usrfiles.com/ugd/0f1814_430fed56b57b4fcd83200cb90e839cc3.pdf
    • https://static.usrfiles.com/ugd/277b62_385479564d6844ff81b3df874c7d80b8.pdf
    • https://static.usrfiles.com/ugd/974a4e_852bde22f1dc436b99411eeba480f646.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/49750209270.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/12343611930.pdf
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/aerobics_music_beats.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/calcular_riesgo_cardiovascular.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5cc.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 2828 bytes
font_01_sfnt_off0000cfc6.bin
6c1ab25d9db06927ebb75efefc05d7e0691fd21396763f8c7fded410f91bcbd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 5304 bytes
font_02_sfnt_off0000e1d5.bin
5706816d96fba638da9178ab0126bb1fd2b7cfea43dcecc14c4d1eaffa7c46eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 9932 bytes
font_03_sfnt_off000103be.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 4324 bytes

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