Malicious PDF — malware analysis report

Static analysis result for SHA-256 445ea25671bf330e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-10 02:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6230436056cb99ec8438860e2b7ca49 SHA-1: 9f02d46135b02bf71b3c8f8b5275166e486908f6 SHA-256: 445ea25671bf330e8a53a3be280d556cb28e1566cfec69fb15a1d848c13ac366
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, with the primary link pointing to a redirector service at 'ttraff.com'. This suggests a phishing or malicious content delivery attempt, likely using the embedded links to obscure the final destination. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, indicating it was likely generated programmatically to host these links.

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=baixar+livros+gratis+em+pdf+passei+direto
    • http://files.grammarrugby.net/uploads/1/3/1/3/131383325/4d91b9.pdf
    • http://rubume.kimtarrestaurant.com/uploads/1/3/1/8/131856372/rozovevo_newadovujolebu.pdf
    • http://towudif.alroofingleeds.com/uploads/1/3/1/4/131437886/ralopafivewupod-vukomukafi-kimutisuw.pdf
    • http://files.therisingsuncottage.com/uploads/1/3/0/8/130874536/futuno_wumitusig.pdf
    • http://files.osakislutheranelca.com/uploads/1/3/2/6/132695325/jinodopisag-sorukiradomalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/92484558626.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/50020633913.pdf
    • https://cdn.shopify.com/s/files/1/0438/4351/8629/files/snipping_tool_shortcut.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/1998_buick_lesabre_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/abroad_times_paper.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/zutivobixuwivufa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/borefidubumesasefavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/cs_go_dragon_lore.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/2424103518.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/30148250166.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54171278856.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/66844351854.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_off00006783.bin
f03dbd166c6f5b70784b0aa8ddcde713db6511fc2103fe6cfae6fa07fe383ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6783 5536 bytes
font_01_sfnt_off00007a53.bin
ccf811a268318b30ef5ce5773b50a94b33052c471d0c41e90470a5316863d4e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A53 11732 bytes

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