Malicious PDF — malware analysis report

Static analysis result for SHA-256 598cfedbeb9478fc…

MALICIOUS

PDF

36.6 KB Created: 2020-08-14 16:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec58cd701f36564568910b7946110a80 SHA-1: 28a7a6b0684fb6f3e29604ca0a0cdd540c94f7e9 SHA-256: 598cfedbeb9478fc94f0ca0bf463c68cb5a62922746209ea0d37f505ef6b73e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=afasia+transcortical+motora+pdf'. Another heuristic detected a large PDF link farm, with many links pointing to Shopify domains, but also including suspicious domains like 'tefexezi.wilsoncreekkennelsllc.com' and 'files.lookitschris.com'. The document body contains garbled text but also includes the malicious redirector URL, suggesting a lure to external 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.cc/pify?keyword=afasia+transcortical+motora+pdf
    • http://tefexezi.wilsoncreekkennelsllc.com/uploads/1/3/0/7/130776031/6279343.pdf
    • http://files.lookitschris.com/uploads/1/3/1/4/131438211/gejibewomepivalov.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2039/files/66471887738.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/73639896951.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/4411095396.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/bopedibabejunuposofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5250/7036/files/23153742718.pdf
    • https://cdn.shopify.com/s/files/1/0439/6200/7710/files/ielts_speaking_practice_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/nebokipavotulaguzob.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/39517917903.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/2668320449.pdf
    • https://cdn.shopify.com/s/files/1/0433/9502/3013/files/difference_between_flat_slab_and_solid_slab.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_off00005162.bin
1957e4547077d6bdfeca75ae02dc8365a27dc7b48812f245498eb8b8b7c8d4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5162 5288 bytes
font_01_sfnt_off00006339.bin
32754ba142baf753153d63ab205b5ebd28f607736d6711b31975b594ce904bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6339 10160 bytes