Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f13f2cdc52a6e91…

MALICIOUS

PDF

54.1 KB Created: 2020-10-11 02:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc6991b7a8b59069c2829b3f7a3c3d82 SHA-1: 11816515919f12ef1700ec54de96c57277043a1f SHA-256: 1f13f2cdc52a6e91e05474ac9334cbef6b3d633d743a53c5265a5ad32dec1a23
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the primary purpose is to drive traffic to malicious sites, likely for phishing or further malware delivery.

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://ggtraff.ru/strik?keyword=i5+4690k+overclock
    • http://wizen.manuelarossini.com/uploads/1/3/0/7/130776298/c1433c0d2963.pdf
    • http://volufowe.ephsultimate.org/uploads/1/3/1/6/131636725/1573706.pdf
    • http://nefujo.fashionspeaks.net/uploads/1/3/1/8/131856166/81317657fadde28.pdf
    • http://files.sirratleather.com/uploads/1/3/2/7/132740978/luzedisemivefidit.pdf
    • https://site-1037240.mozfiles.com/files/1037240/30554554872.pdf
    • https://site-1039765.mozfiles.com/files/1039765/gasubibadazinuxuxozal.pdf
    • https://site-1038402.mozfiles.com/files/1038402/simog.pdf
    • https://site-1041949.mozfiles.com/files/1041949/60117679725.pdf
    • https://site-1040438.mozfiles.com/files/1040438/12045206545.pdf
    • https://site-1036960.mozfiles.com/files/1036960/53221536500.pdf
    • http://suzaxopi.demoderbydvd.com/uploads/1/3/1/4/131407148/2268581.pdf
    • http://sononibep.agorapublications.net/uploads/1/3/1/4/131437130/98606b628614.pdf
    • http://mitamali.blucollaritgirl.com/uploads/1/3/2/6/132681072/pudazamudefakimixafe.pdf
    • http://volufowe.ephsultimate.org/uploads/1/3/1/6/131636725/1573706
    • 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_off0000896f.bin
ed9e8fe33c821e8e08b5f8cb70a2e31b87da8facb26226a54e25ef629aa83d7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x896F 5132 bytes
font_01_sfnt_off00009afe.bin
230061da43f521be8e5e579defd28b07072e666b815118fe85f7be460cc77a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFE 15588 bytes