Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f1eb2abd6f9dd6…

MALICIOUS

PDF

86.7 KB Created: 2020-08-29 19:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73fd7a478e8cbd74e101554d124f2075 SHA-1: 42e436db4dab2c86b92a4409f920de1da5c485ed SHA-256: 70f1eb2abd6f9dd668444327cd5010a27667303e18ffd8481a529c788ed0ec29
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to drive traffic to various sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document, likely used for phishing or traffic redirection.

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=%25D9%2585%25D8%25A7+%25D9%2587%25D9%2588+oomf+%25D8%25B9%25D9%2584%25D9%2589+%25D8%25AA%25D9%2588%25D9%258A%25D8%25AA%25D8%25B1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_7f1e0dc7c3784a71885cc4e90e2eee38.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b631993c6244b6d967a658805543a77.pdf
    • https://static.usrfiles.com/ugd/b8c837_35847d17ca634e0f92ce52dfb6e6f35f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd33b18b82f54cf28e2726869c1ee28e.pdf
    • https://static.usrfiles.com/ugd/b8c837_33e1cc63d4504eafa87113d5abcd29bb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7605/9290/files/88444756565.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/20421739319.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/gasewesomoxose.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/88198334532.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/assessment_of_learning_2_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_5671c48fa6b54474b557c66f84927911.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d791ac1433d47b5ae15dd4042e1d47c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea4791ef89ca4ce79789d26a538d9868.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f64b48ba92745fcb58da6a16f35c53d.pdf
    • https://static.usrfiles.com/ugd/b8c837_52b1f7723aae4e51b8b7a0f5db87dec4.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb2342e4cc7149548583e6331d9b8661.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011101.bin
46e7bc209b9ef52f77b4dc00c7f25c47aafa8d93ca9df0fcf99e9e382211de91		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11101 33784 bytes
font_00_sfnt_off0000c8f2.bin
64201cf27d468157e2c712ea06b58f25ced344949a89992802fb4c490c89368e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 4300 bytes
font_01_sfnt_off0000d782.bin
41c0ce2eb06cd1f08cf9a748b0d08f8fe6e86a1162362dea207b039fc39b1749		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 17364 bytes
font_02_sfnt_off0000f10c.bin
07f3c238ad1ad4ac6eace9a6fb17697715f76622b6697a6e789d389eec3a4d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 9312 bytes

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