Malicious PDF — malware analysis report

Static analysis result for SHA-256 786a61c9fbab7f6c…

MALICIOUS

PDF

54.0 KB Created: 2020-08-02 07:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ff5decf19f03a911af1e93291d674e SHA-1: 3283cdc24cd872498c90f2f4c90f89f574fc1138 SHA-256: 786a61c9fbab7f6c107b0aa528ce469bf4024b2f7d300e5a3ddd95e9e67ffd4d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=natalie+portman+lonely+island, which is likely used to redirect users to malicious content or phishing sites. The presence of numerous links suggests a link farm or SEO spam campaign.

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=natalie+portman+lonely+island
    • http://files.southtahoefootball.com/uploads/1/3/0/8/130813427/9443788.pdf
    • http://files.yestojesus.net/uploads/1/3/1/3/131378868/pusimugemawifotake.pdf
    • http://files.anniepoole.com/uploads/1/3/0/8/130813413/3048650.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/kegufulogurebazij.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/53385579343.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8845/files/wovadobobinazinefif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/scatter_plot_correlation.pdf
    • https://cdn.shopify.com/s/files/1/0431/9949/6351/files/94054142355.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/ffxiv_buying_a_house.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/92945309611.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/mawalimekete.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/boot_hill_rpg.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0652/files/16583489616.pdf
    • https://cdn.shopify.com/s/files/1/0431/9500/7137/files/50953496727.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.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_off00007b88.bin
439ae0cdf9d6ebe0e3a9fe1640b2a2d58fd43820bf5ac2ba9dab39e461507d68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B88 7276 bytes
font_01_sfnt_off00009425.bin
7636d1c38c1cf9b64889691c5bac3b577e0ac2a14f5c848466c65d40fa42e232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9425 5176 bytes
font_02_sfnt_off0000a5b4.bin
489907ec7402364dce438c426365fb2bcf9dea3fe98fd539ffff263fcd073ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B4 10308 bytes

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