Malicious PDF — malware analysis report

Static analysis result for SHA-256 066d1ff9fe7b248f…

MALICIOUS

PDF

44.0 KB Created: 2020-09-02 06:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c6af424114da0f084d77c3229fcf1b7 SHA-1: bb182b8cddc592834b9dcf7424e997b1bb19bb25 SHA-256: 066d1ff9fe7b248fba57c7beaca542ffcf3ff99b0ececf9adc7c08c1618c252e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a mix of text and URLs, including the malicious redirector URL and a Shopify-hosted PDF, suggesting a link farm or content hosting strategy. No scripts were extracted from this sample.

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.com/wix?keyword=11.+4+meiosis+worksheet+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/cafeteria_management_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/wetap.pdf
    • https://cdn.shopify.com/s/files/1/0435/6902/1089/files/video_anis_merah_teler_doyong.pdf
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/bagafotagumigibovajivi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/19734191860.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/29145857919.pdf
    • https://cdn.shopify.com/s/files/1/0438/6547/3189/files/lerosiveteva.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1289/files/cask_amontillado.pdf
    • https://cdn.shopify.com/s/files/1/0460/1875/6767/files/a_formal_letter_of_apology.pdf
    • https://cdn.shopify.com/s/files/1/0464/6089/5384/files/consumer_reports_apple_watch_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/zifujizagesuwobe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3543/3887/files/pexisabogusawago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/9775040964.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_off00006ef9.bin
71c797d0ce55eef67ca9632736468d24e46a132d59992c007f8d5a2518163656
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF9 5016 bytes
font_01_sfnt_off00008006.bin
b6af1c7380d15c452cf517e34052d0b7d5e82c74e945083a1be3c2355a730dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8006 10424 bytes