Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8c2f7121424b14…

MALICIOUS

PDF

47.5 KB Created: 2020-08-07 13:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d72beb1065bac1220ada142cdcc7fded SHA-1: 7963264268be04423b98c412a9aa2706bd3610f0 SHA-256: bf8c2f7121424b14d76203be98dfab6d4effd054631473b76a3085573ea9640a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=toefl+ibt+reading+comprehension+pdf, which is also listed as a malicious redirector. This suggests the document is designed to trick users into clicking the link, likely leading to a phishing or malware download site.

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.cc/pify?keyword=toefl+ibt+reading+comprehension+pdf
    • http://files.shoptrueblessings.com/uploads/1/3/0/8/130813582/7401691.pdf
    • http://files.caffegiocondo.com/uploads/1/3/0/7/130739778/acfb797ab.pdf
    • http://files.ratingsguru.net/uploads/1/3/1/4/131406202/rukuginotak.pdf
    • http://files.islandresearchph.com/uploads/1/3/0/7/130739275/545d99c236c07ae.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/varezobirijenor.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/xezobuvuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/classic_man_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/wcf_test_client_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/zizutowenufod.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/76817156544.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/kigususojitofigidavex.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/tatugemovapod.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/zakuwoxag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/76915692706.pdf
    • https://cdn.shopify.com/s/files/1/0433/6323/8056/files/jama_sepsis_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/16372521271.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065d6.bin
d1401bbcbcbddcb674af3e2162b8a852886be28927f87aa37f9bb325870e7cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D6 5660 bytes
font_01_sfnt_off000078e6.bin
2e3a5a89c62c24da7904c2f712fec65677d29121bcab05d2232bdaaa1937cb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E6 10016 bytes
font_02_sfnt_off00009b60.bin
18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B60 16144 bytes

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