Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddea85b7c53b782…

MALICIOUS

PDF

46.8 KB Created: 2020-09-01 02:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b505e0b81e3eabf5cb8cfc245b00ab9a SHA-1: 1734b15f2e0a6cbafa4f35706642b2cad07eb292 SHA-256: 5ddea85b7c53b7828ec8899c1283785d2e07f08611c54ab102f3c786ef2cce0e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links but one critical redirector. The presence of a 'download button' lure further supports a malicious intent to redirect the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=bewafa+bhojpuri+dj+song+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/7002/1014/files/84719906636.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/84892943191.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/75825120756.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3362/files/chrono_trigger_rom_snes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/65254954703.pdf
    • https://static.usrfiles.com/ugd/9e41f0_5ea17fd4310541a7a954db6d50337bae.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/wezonoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/dizijetoled.pdf
    • https://cdn.shopify.com/s/files/1/0463/2448/2210/files/excel_formule_arrondi_entier_le_plus_proche.pdf
    • https://cdn.shopify.com/s/files/1/0440/4455/0294/files/emotions_worksheets_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0439/0912/0152/files/ssa_1724.pdf
    • https://static.usrfiles.com/ugd/9734e7_e35bd652b00e47d2897784150cdef802.pdf
    • https://static.usrfiles.com/ugd/a298ce_0e06a0413a304192b72fc0e0a134f22a.pdf
    • https://static.usrfiles.com/ugd/81d6a4_fb79cfe4650d4a8bb7849d288040e247.pdf
    • https://static.usrfiles.com/ugd/ca300b_79c9ea544c4648169ff7c8ce4cc58f9a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da1.bin
b3d5fbbc47c75a51f1c0aae68cf02663a7c9c0a7737a0279526a61c33b3c1f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA1 5628 bytes
font_01_sfnt_off000070d4.bin
053c5dc3e08cabfcd103149fbcd746947ae77683338f5ea975c448e6791a5413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D4 14968 bytes
font_02_sfnt_off00009ef2.bin
ff2e1c3daf0a27abfc103a3e041ff12a4e7c41969cbdb1167cf5da1988c7c517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF2 4004 bytes

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