Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f051ad0b4004ad…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 09:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e828d307eedc200186ab2eac6363fc SHA-1: afb0d00401318678eebfb482ee9c5d46f2910c88 SHA-256: b4f051ad0b4004adbd330f9657c129f15fd3f915aaab1bb1875e64dce05740d3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm designed to obscure the malicious destination. The primary malicious URL is 'https://ttraff.com/pify?keyword=kinetic+molecular+theory%2528+kmt+worksheet+answers', which likely serves as a lure to download further malicious 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.com/pify?keyword=kinetic+molecular+theory%2528+kmt+worksheet+answers
    • http://files.pittsburghighschoolband.org/uploads/1/3/2/7/132740805/nafiwize-gowukew.pdf
    • http://sixuzuju.designcycle.co/uploads/1/3/2/3/132303382/ba2c8.pdf
    • http://files.mrbsfinest.com/uploads/1/3/2/3/132303080/wozesepivijiwox.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/acid_base_and_salt_class_10_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/zadonigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5620/9819/files/lapititavitotejakitaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6661/3141/files/kafowukesidusopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/44737505082.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/77215364369.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2550/files/assumptions_of_ordinal_utility_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/mipezanelibibib.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/61716924045.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/assassin_s_creed_brotherhood_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/zozumasukus.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_off00005bd1.bin
e759e2317ebd8578e01acdac043a25b06b814c62b9479004804540905b20f2ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD1 5344 bytes
font_01_sfnt_off00006de1.bin
8239d54a6f56774ed02983ae5366946ac08e404c1aee84792c78952e3d23f66f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE1 9484 bytes