Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d4132772f77bfe…

MALICIOUS

PDF

53.3 KB Created: 2020-07-31 06:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7659f464cded8e75dae1478ad1ac416 SHA-1: 118c383db7bc2ce5e73d43380acc261ed19e2e6c SHA-256: 66d4132772f77bfe75b3bcb2633a4205851dd541b727ee90f6bfe44bf81a6bb0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct lure, but the link farm suggests an attempt to drive traffic to malicious sites.

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=penyakit+balantidiasis+pdf
    • http://files.buytriadnc.com/uploads/1/3/2/6/132681698/kegogeg-losipafego-kusikigaj.pdf
    • http://files.sweettearestaurant.com/uploads/1/3/0/9/130969798/tiregu-dazutobewezir.pdf
    • http://files.brianwhitson.me/uploads/1/3/2/7/132710630/feturopunuzox-lomeparene-petasopudi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6083/0111/files/zipila.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/pixajelaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4663/files/jinesezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/tugowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/jaliz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/vuvikarajesorudovud.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3474/files/59997903117.pdf
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/9488687733.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/9564449428.pdf
    • https://cdn.shopify.com/s/files/1/0431/2881/5783/files/xizit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7591/files/zuvejofewon.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/63024833633.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/35482868230.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008654.bin
4f83ea47469cf33e8404e2f6bbc10f5175511170372b250eb4bc90301874df23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8654 4924 bytes
font_01_sfnt_off00009720.bin
a96ef9ad7dd17b664ef189ff31a758f8bf5a03f9b4687bc78d2ddf25245e1492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9720 15380 bytes

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