Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e803895053ee69…

MALICIOUS

PDF

47.1 KB Created: 2020-08-10 09:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e54d90664f78e3f4bd2dbcd80550745c SHA-1: 79853dbe63eef2df2789f1f9b586369a91431140 SHA-256: 92e803895053ee6993866c1d0d3a7f92fe2ae2c2dbeaaef3c11f905809ce6c46
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it is a redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=qubee+afaan+oromoo+barreessuu+pdf', which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on cdn.shopify.com.

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.ru/pify?keyword=qubee+afaan+oromoo+barreessuu+pdf
    • http://files.beechfieldumcbalt.org/uploads/1/3/2/7/132741293/7532596.pdf
    • http://files.carolynnewilcox.com/uploads/1/3/1/4/131438500/4b8b9329dd9f.pdf
    • http://tikivanew.tasmanissues.net/uploads/1/3/2/8/132814930/28831c711.pdf
    • http://wudifux.unitedsafes.com/uploads/1/3/0/8/130874633/wefudeliterofaxov.pdf
    • https://cdn.shopify.com/s/files/1/0438/2362/8450/files/nahuatl_diccionario.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/1664187201.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/29098664148.pdf
    • https://cdn.shopify.com/s/files/1/0430/2723/4969/files/rotanatutoligodowefipur.pdf
    • https://cdn.shopify.com/s/files/1/0430/2215/5930/files/14626562953.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6112/files/blob_download_file.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/partition_piano_valse_amlie_poulain.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604d.bin
65c0580c9e192ddd28b204b35ddf9cd7437b6cca5da39c428d47a93079485daf
pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 5108 bytes
font_01_sfnt_off00007178.bin
5a5a7a2271ee38048a315fea73ca66b19ce709d87724f4823ccc607bf3643d3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 14900 bytes
font_02_sfnt_off00009f2d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2D 4324 bytes