Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ef3a477852d017…

MALICIOUS

PDF

103.5 KB Created: 2020-08-10 22:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e144799288fb8da3d8e31f1842ff3524 SHA-1: 1e5adf9b524932a2b7fc66bc941441c4929858a6 SHA-256: 11ef3a477852d017b3b1caadb81e3e001b1c4b28108ff839305fffd94e26c424
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'nursery rhymes download pdf' and a URL that appears to be part of a link farm. This suggests a phishing or scam attempt where users are tricked into clicking a link that leads to 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.ru/pify?keyword=nursery+rhymes+download+pdf
    • http://files.thewellsessions.com/uploads/1/3/0/8/130814914/pekugitorovabapa.pdf
    • http://wexemizef.lilyhock.com/uploads/1/3/1/0/131071164/xufubuvir_zekiginatug_duwukufidonat_mokejegusi.pdf
    • http://lewumuv.aerosportoutfitter.com/uploads/1/3/1/1/131164250/2adce598fa31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/gexumigerizezorewuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/26362837308.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/aos_generals_handbook_2020_vk.pdf
    • https://cdn.shopify.com/s/files/1/0429/2388/4711/files/alcois_e_fenois.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/bozezanokojawajud.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8999/files/nabiwevarorokewufezitukip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/75285316771.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/fundamentals_of_metal_cutting_and_machine_tools_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/norojuwenopop.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_off0001415f.bin
cfedbcf0066bb7ae4ff7825a1751191e211b24daa2bc0a93557c1b5541ab17b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1415F 5200 bytes
font_01_sfnt_off000152fb.bin
63ced6cba43fb3f1232d0b7aa8163a93faff20f41dc9f399a0afd5da6ecc31cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152FB 15568 bytes
font_02_sfnt_off00018339.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18339 4324 bytes

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