Malicious PDF — malware analysis report

Static analysis result for SHA-256 efffda043473080d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 18:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf9e01f21845582904971b0ecf4e221 SHA-1: fa162ebfee866a14ce32a3248a45c6be226cbe5d SHA-256: efffda043473080d968d5845e1a5ed678cddb7b8a5c28e13acb3eff9dbf44d9c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to potentially malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=let+my+love+adore+you+song'. The document body contains obfuscated text and metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=let+my+love+adore+you+song
    • http://files.tomdiviny.com/uploads/1/3/1/3/131380029/feniwuvowosutil.pdf
    • http://files.4-states-irrigation.org/uploads/1/3/0/7/130739766/8bcd82f65e.pdf
    • http://files.fieryoverforty.com/uploads/1/3/0/8/130874192/3060130.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/vector_calculus_4th_edition_colley.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/bang_bang_audio_songs_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/38596432973.pdf
    • https://cdn.shopify.com/s/files/1/0434/9142/6469/files/57685030431.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/ziwivizuvegeramuwito.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6919/files/angina_de_pecho_clasificacion.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/bs_english_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3899/files/internet_coffee_shop_business_plan.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_off00005b26.bin
8c9dd8ecc410b964eae2ccca5a5c1671ca8adf5ee0f7d7d263f86bef601bc4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B26 5248 bytes
font_01_sfnt_off00006cfb.bin
d161fc1ac545faf01e3b4e7419891780048358b605dc01218dcaf5be6ac7229b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 10548 bytes

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