Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f43ccf5c3d4843d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-18 14:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b0a56fc8c981e8fe3bc0813b43af02 SHA-1: 268d67bb18f92355b99a1f4b78f79e82b6aa14f9 SHA-256: 5f43ccf5c3d4843df5dba6796d2a9e906aeba1bf9b4dea029ebcd528507e18ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection scheme. One prominent URL, 'https://ttraff.cc/pify?keyword=apache+tomcat+8.+5+for+windows', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=apache+tomcat+8.+5+for+windows
    • http://files.budget-georgia.com/uploads/1/3/1/4/131483148/34629857.pdf
    • http://files.tobincosten.com/uploads/1/3/1/3/131379312/limovegolebe.pdf
    • http://lojesedu.bankersumbrella.com/uploads/1/3/1/4/131407995/a5492a4f.pdf
    • http://bebekori.elecflex.greatwebsitebuilder.com/uploads/1/3/1/6/131606490/6906689.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/future_will_going_to_present_continuous_present_simple_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/89862797825.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44329390643.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/geographical_indication_act_2013_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0436/2600/4642/files/8254226930.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/bojeku.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/disulagogosag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/sahih_bukhari_hadith_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/38307522934.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/employee_awol_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/48273745129.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_off00006301.bin
96782cc476869ad066a66ad2030cc577db88ffde67126d88d3c1607d6e14d15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6301 5792 bytes
font_01_sfnt_off000076ab.bin
6f2596a928d6c9de6a43444eb15a4e58f37dbb96005528d6ea7fc2f38f517191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AB 10016 bytes

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