Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8516d16c71183c…

MALICIOUS

PDF

51.5 KB Created: 2020-08-22 22:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47514be756c214d0af33022237c4ff60 SHA-1: 33bb788d19e04303e7979191075d69078244aa85 SHA-256: 6b8516d16c71183c6ff9ce422f908c20a624cfbe3c2b518a4f9e72592d31a153
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=report+card+comments+for+struggling+students, which is a known malicious redirector. This suggests an attempt to lure users to a malicious site under the guise of providing educational content.

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=report+card+comments+for+struggling+students
    • http://files.awha.org/uploads/1/3/1/4/131437948/dobara_zajefuzar_tipefoxagokof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/simple_sql_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0439/5650/2686/files/alanine_aminotransferase_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/detail_magazine_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/47103434376.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/chirru_kannada_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/coffee_bean_and_tea_leaf_menu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2312/8986/files/gezobogewi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/69211838509.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/boxuxupuwiximis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/kapor.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_off00008d2b.bin
cf09e5521eed29e5fbb039f329bb54bf0b17e616301736f317c9139be726a436
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2B 5484 bytes
font_01_sfnt_off00009fbe.bin
ea1843d1119e42c28cdd1d4082ae2baa6e88e41e496ee8875361e6e56f61da93
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBE 9728 bytes