Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb0ef50f4b3a340…

MALICIOUS

PDF

41.6 KB Created: 2020-08-22 02:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5e499094586f805ef68cd0af899e17 SHA-1: 70697779e2ad6a3f1e78cd70ab5124e5c9b29f2f SHA-256: fbb0ef50f4b3a34071206df585bd9378a9428bd5a1e94df31669097ee4275a78
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a phishing or malware distribution attempt disguised as a document. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious redirector is a high-priority indicator.

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=ammonium+carbonate+msds+pdf
    • http://files.trilloquy.org/uploads/1/3/0/7/130776724/5680806.pdf
    • http://porumu.lexingtonlatinschool.com/uploads/1/3/1/4/131437361/0f2768bc1.pdf
    • http://files.brianskahn.com/uploads/1/3/2/6/132681030/104182.pdf
    • http://files.cliniqueveterinairedecantley.com/uploads/1/3/1/6/131607889/saxufez_muwas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/android_game_emulator_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/megupiguxofas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/carnatic_music_notes_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/69035448904.pdf
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/24191457808.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/20886173404.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/22912341679.pdf
    • https://cdn.shopify.com/s/files/1/0434/6619/5106/files/35476370942.pdf
    • https://cdn.shopify.com/s/files/1/0437/6277/8263/files/dawidusok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/albins_performance_transmissions_ballarat.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/tuxatavapejatijodosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3036/files/joxafalozo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0541/0471/files/75670099835.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_off00005efd.bin
dbf6276b495445dcbb8019139054e84a6d4e2b15afbf361c9bc001f14e4f7095
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFD 5396 bytes
font_01_sfnt_off00007131.bin
ea5b5fa957f13d133b9cdde3eb8d3df8ea9ef8caea43db695b3d1f0dca9946d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7131 11808 bytes