Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe23257a751a22c…

MALICIOUS

PDF

49.8 KB Created: 2020-08-13 11:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a19a412316e8b07e3514991127b43b SHA-1: d2fb9ab2a22af21fc22726b41c57d531711b18ed SHA-256: 4fe23257a751a22c20cd0c3758ded260c6f77b4e2c22a322c68e809302fe7955
152 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 'https://ttraff.cc/wb?keyword=klasifikasi%20batuan%20metamorf%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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/wb?keyword=klasifikasi%20batuan%20metamorf%20pdf
    • http://files.lexmarch.ca/uploads/1/3/0/8/130814078/90637ce1.pdf
    • http://files.patriciajonescounseling.com/uploads/1/3/2/6/132695354/5828400.pdf
    • http://files.ivoryleaguepublishing.com/uploads/1/3/1/4/131406435/620fa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/tegujojojedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3197/7370/files/11303651275.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/2689695997.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/vonelodewetikavunepelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/53886989479.pdf
    • https://cdn.shopify.com/s/files/1/0433/0841/7192/files/4chan_file_size_limit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/sazapupitubigiretipikulug.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/71955764804.pdf
    • https://cdn.shopify.com/s/files/1/0438/8097/2456/files/san_onofre_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22700630349.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/20486086240.pdf
    • https://cdn.shopify.com/s/files/1/0438/5590/4918/files/94737090630.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/58475676272.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085c9.bin
f4b216338dfefc3d56a0e15692f86bf9a765d900dcdeb60f41d5d8f88984b8e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C9 5360 bytes
font_01_sfnt_off000097e0.bin
e2f2f7b724e406958c026a16b24fbc702e025bf789823f5b63ebc69727616c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E0 10020 bytes

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