Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79cf4fab4b2a6da…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 17:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db43183bc3a8a580dbe602881cdb26c0 SHA-1: ec7c6a6056a85119016c22894341fabf40cb1d7a SHA-256: e79cf4fab4b2a6da844420c858f8d457e0a5fd544766665a8c1a071edc5d41ea
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes text referencing 'Wipo pct applicant's guide national phase' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=wipo+pct+applicant%2527+s+guide+national+phase
    • http://zuzesux.growinghappyroots.com/uploads/1/3/0/8/130814328/nexudiripoko.pdf
    • http://files.martialhartamas.com/uploads/1/3/0/8/130814279/6186ec0be38b.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/walovuxilolakotoden.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/lefasavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/kijujidaropenevureraw.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/tiwalivunuwipab.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/remove_characters_from_string_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/colposcopy_guidelines_20.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/44085878771.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/11275559294.pdf
    • https://cdn.shopify.com/s/files/1/0434/1235/7270/files/caged_system_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6722/files/aqeedah_tahawiyyah_arabic_and_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/30115422246.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/lunapic_transparent_background.pdf
    • https://cdn.shopify.com/s/files/1/0441/2529/0648/files/mhw_iceborne_quest_guide.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_off00005e2f.bin
d70607f11566b6d444f33d9c8c424b7378c6b606cc09c5945c7ae754554761bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2F 5284 bytes
font_01_sfnt_off0000702b.bin
268d3eeef91859f97095a7b5d84dbb357cda99ca8ea54fb202a0267214fdc230
pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 9568 bytes