Malicious PDF — malware analysis report

Static analysis result for SHA-256 0163a59564004207…

MALICIOUS

PDF

35.6 KB Created: 2020-09-02 01:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 117e470ea6fa03e35c18b13edc9c22b7 SHA-1: 3269729f5ae466e3cc29cc3d2e12ed7965c0fb5a SHA-256: 0163a59564004207f84e7442285b8141faed41469dbfa0729545060a354b6bc9
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a textbook download. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the embedded URL confirm this redirection attempt. 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.ru/wix?keyword=icse+maths+textbook+for+class+10+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b17ce93c91c3442898b4e0ee7fd53639.pdf
    • https://static.usrfiles.com/ugd/c6ac46_8c9fea5a226a40ea812c93508246bdd7.pdf
    • https://static.usrfiles.com/ugd/c618e9_1c1875002179449b8a4c4b2c6292fbb3.pdf
    • https://static.usrfiles.com/ugd/7f16bd_aa68103047394de7bb08198c704f62e2.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_f4cc4dc65625489baf9d1503861a084e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc2a8d158dd94335a705d6c1246d6646.pdf
    • https://static.usrfiles.com/ugd/a64c8c_3c7d09cbe57b42398a31a118d4da43cb.pdf
    • https://cdn.shopify.com/s/files/1/0460/3694/3007/files/destiny_2_dreaming_city_bounty_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/cisco_catalyst_3850_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ba0.bin
024ebbe801eebe636310998c5c97a68e48842b72e8fa7c7068b4b0b0fa90c8ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA0 5796 bytes
font_01_sfnt_off00005f37.bin
91e40481369f8a6e3e2cb3545e4e6be32f8a1002bd1e55060eefbbb3d746c17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F37 10168 bytes

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