Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f940e7ee745ac1…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 05:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bcfd91b4e07bceaaf8b949123038a0b SHA-1: 60a7faf3e2deaf66fd618dc064c473b2b33928c4 SHA-256: 55f940e7ee745ac1b58ead73914bcd08ddb6002bae8b4c1f7cd2a42a0022c13c
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a known malicious redirector at `ttraff.com`. The document body, though obfuscated, includes the same lure text and URLs found in the heuristics, suggesting a deliberate attempt to direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=tinkers+construct+guide+1.+12.+2
    • http://toxipo.legacycaengineering.com/uploads/1/3/0/9/130969690/f2a1bd.pdf
    • http://files.capitalareamta.org/uploads/1/3/1/4/131454012/685306.pdf
    • http://files.sy-laroobaa.com/uploads/1/3/1/3/131380158/pamanakurasedaner.pdf
    • http://files.mariettapilgrimage.com/uploads/1/3/0/9/130969931/vobobov.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/webogabesonedabigol.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/wusudomafaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/game_design_document_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6615/files/digewafekomosonones.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8262/files/game_purble_place_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/53052087163.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/40752546921.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/nojeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/8135/0820/files/cutaneous_anthrax_case_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/enzymes_in_poultry_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3771/files/doing_case_study_research_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/78971745528.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_off00007342.bin
77c95c0aa11bcbdcb50ac74ce5fa62e031654b4438b8e2487b79aa85bbb857a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7342 5092 bytes
font_01_sfnt_off000084ad.bin
b131dbc9d443cd6fc27af0c851232cacde78d37150379e0375a4975a1fcfadae
pdf-font-stream PDF embedded font (sfnt) at offset 0x84AD 11068 bytes