Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8395f961079af14…

MALICIOUS

PDF

41.5 KB Created: 2020-09-04 07:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 270139966ff1e604e2640d8d6864750e SHA-1: 6e1ed65fb2fb2e205df46b8934fe5d0c78a9f9f7 SHA-256: f8395f961079af148651a91063985737656bd3800b18e190e6b281b6fc31fbff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary malicious URL, https://ttraff.club/wix?keyword=edhesive+assignment+3+chatbot+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to "Edhesive assignment 3 chatbot answers", suggesting a lure to trick users into clicking the malicious link. The ML classifier 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.club/wix?keyword=edhesive+assignment+3+chatbot+answers
    • https://static.usrfiles.com/ugd/4c76bf_055a3c9e33de47f4bb63cbef16d59a8f.pdf
    • https://static.usrfiles.com/ugd/ac72e0_b2a155673b454b76b2755ea0683cbdcc.pdf
    • https://static.usrfiles.com/ugd/23e9be_e587a28c76b143239a69b1dd872e9b65.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bec7f00dfa645c18488ffa75b96729d.pdf
    • https://static.usrfiles.com/ugd/fedf23_5a9ec477c29e41b49a06a0e968c3dfae.pdf
    • https://cdn.shopify.com/s/files/1/0439/4765/5323/files/canabalt_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/kumon_k_math_answer_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/64151719812.pdf
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/84_charing_cross_road_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/dozewewix.pdf
    • https://cdn.shopify.com/s/files/1/0436/5176/0281/files/animals_worksheets_esl.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zodotuxufaliga.pdf
    • https://cdn.shopify.com/s/files/1/0429/4072/7463/files/96695842178.pdf
    • https://static.usrfiles.com/ugd/89064d_d3dc35530950400f903dfaec20389e1b.pdf
    • https://static.usrfiles.com/ugd/108936_ce0a4ab95c094ff4beb4ea232efa7a2c.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000620b.bin
84800ee9db3f68e6b7f6232bff5546c5cccd2ae473fb09a2ecc789562d565cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x620B 5736 bytes
font_01_sfnt_off0000757e.bin
e21126bbb935e2096581a7682c44ab31bc2c1e52c9672810c74942d5c17da0eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x757E 10536 bytes