Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7516e4daaf3a44…

MALICIOUS

PDF

57.5 KB Created: 2020-08-29 20:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43b8f3b07966c4b607cb333d5ad622fb SHA-1: 0db1c5f0ec9be455950bd5ce44014bbd9a4f95df SHA-256: 5a7516e4daaf3a448a657c0a6a50c7553fdc31247b019454d7ca6b8ee1c7e1f7
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Stephen King Shawshank Redemption book pdf' and a URL that appears to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be tricking the user into clicking the malicious link.

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=stephen+king+shawshank+redemption+book+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_30858911a0054573b0a9ae70025310ba.pdf
    • https://static.usrfiles.com/ugd/10e3af_c0a09ed0d1014e52b9dc550f72cc0c48.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb6a9758c2f04997957071f5dc67302f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cc1ff8c49264674aebd911e5a5f93b6.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/asic_design_flow_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/8954/3836/files/19676148837.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9083/files/impact_of_branding_on_consumer_buying_behaviour_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/wii_fighting_games.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/532937482.pdf
    • https://cdn.shopify.com/s/files/1/0439/6023/8238/files/linaximelovol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/gowuwut.pdf
    • https://cdn.shopify.com/s/files/1/0463/2923/3568/files/fadutexetogegujom.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/aterosclerosis_carotidea.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/49543961890.pdf
    • https://cdn.shopify.com/s/files/1/0459/0010/3834/files/23715042042.pdf
    • https://cdn.shopify.com/s/files/1/0438/1048/8477/files/96496579232.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/fejemuzinug.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/78179463183.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094dd.bin
70aa4337cd0a453a828ea1a3a61888d826f361b4e69fa37cd92be8aaf895db07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DD 5612 bytes
font_01_sfnt_off0000a7c8.bin
5be4ce1a4632586a17f1b82ac7d87740e6a527fd83371d20518964b90c462485		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C8 10076 bytes
font_02_sfnt_off0000ca3f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.