Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83a198ea3db66e9…

MALICIOUS

PDF

53.1 KB Created: 2020-08-16 17:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e0286fd1413ad6630d2e8ebf27c35c SHA-1: 53d6a2af55887956e920ddd51e92d99ee4e89f1b SHA-256: c83a198ea3db66e9990731704ca3dca453b9ea428fde13b1e0a70977cf52ee1f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and references 'nice guidelines diabetes type 2 treatment', suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, but one specific URL on 'popaduku.abbymenagerie.com' is also present and potentially malicious.

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=nice+guidelines+diabetes+type+2+treatment
    • http://popaduku.abbymenagerie.com/uploads/1/3/1/4/131438474/a32117a2e.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/watavitixexuguno.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/nutabofudifuwasutiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/saroniraje.pdf
    • https://cdn.shopify.com/s/files/1/0452/2079/0423/files/58287442273.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/38030242073.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/padasuxazipok.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/datebumek.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/the_haunting_of_hill_house.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/49999635395.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/kuzunifobediratadu.pdf
    • https://cdn.shopify.com/s/files/1/0446/2919/6963/files/monobewukipatasivu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009201.bin
631f6078817cd71f41d9932e1dc1a16e75f99e75f4a56d85911cb0436bb71b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9201 5736 bytes
font_01_sfnt_off0000a56f.bin
0d83f4dde3ece1c27aaf54664a2340368228c1af9db31048575deea9404c3c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA56F 9936 bytes