Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f227d613c3b851…

MALICIOUS

PDF

39.7 KB Created: 2020-08-09 18:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57198229899f07c764b5dda0ac1d7302 SHA-1: 1f94c8b7beb264fbf080ea2b52342c602a125bbe SHA-256: 69f227d613c3b85175ecec9b32111ca3d56117a850fe06e777a0e0398d56939d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass link farm, with a primary malicious redirector URL identified as https://ttraff.com/pify?keyword=autoregressive+distributed+lag+pdf. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=autoregressive+distributed+lag+pdf
    • http://files.pennyfineart.com/uploads/1/3/1/4/131453219/5865204.pdf
    • http://files.ncstateroleplay.com/uploads/1/3/0/9/130969545/4382149.pdf
    • http://files.mssteele.com/uploads/1/3/1/8/131856392/6422440.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6488/4384/files/pikakokugi.pdf
    • https://cdn.shopify.com/s/files/1/0450/7946/2040/files/html_to_library_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdf
    • https://cdn.shopify.com/s/files/1/0438/6563/7019/files/65688535446.pdf
    • https://cdn.shopify.com/s/files/1/0434/9168/8610/files/57517020068.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/74455579932.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/wefasitovodamos.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/65583192877.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/4306534244.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/27628900825.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c8b.bin
e0b5555e689077b315a8aa4a2221a58c612f7a848ddfb8e7aade6667b21da7bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8B 5400 bytes
font_01_sfnt_off00006efc.bin
3c3f703a3b42c63ddf2863f03a113168b6c5aa7c8f3da80457e25bd0a7ef0997
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFC 10376 bytes