Malicious PDF — malware analysis report

Static analysis result for SHA-256 efddfbcddde74617…

MALICIOUS

PDF

32.7 KB Created: 2020-08-06 10:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17551639cbc1469278553333688edcea SHA-1: c6a2ec6870ad568e7698c2480ab6746650690fdc SHA-256: efddfbcddde746172b3924945a94f97e4f04b43adbc250d83f7c84f91b3237dc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.com/pify?keyword=visiting+card+design+pdf'. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on Shopify. This suggests a link farm or redirection scheme designed to lead users to malicious content. 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=visiting+card+design+pdf
    • http://files.lightbulbcoaching.co/uploads/1/3/1/3/131384145/puzofexek-monimusogeworav-jegojis.pdf
    • http://tisiju.literacycenterofharlingen.org/uploads/1/3/0/8/130874655/firorafepekil.pdf
    • http://files.cookislandsoptometrist.com/uploads/1/3/1/6/131607029/186d53c3b68079.pdf
    • http://files.westwoodhoops.com/uploads/1/3/0/8/130813887/loxabikenuwu_gawesokifig.pdf
    • http://files.katieargyle.com/uploads/1/3/2/6/132695535/8362640.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/27258069004.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/23483292079.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/berger_parker_index_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/wekukeguxefoxedosoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0215/7466/files/28035020767.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/46282845211.pdf
    • https://cdn.shopify.com/s/files/1/0434/3326/3253/files/tabifadafizegivir.pdf
    • https://cdn.shopify.com/s/files/1/0434/9611/2294/files/xowirefabe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/lawezaliwafiragopup.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_off0000440c.bin
81500d138282fda52aa8e324207650238827c87f3789f111297fbcbeb3048544
pdf-font-stream PDF embedded font (sfnt) at offset 0x440C 5256 bytes
font_01_sfnt_off00005603.bin
7cc45061751c815de5747da796829dc4a626af0f24a6452a9b431e3b59c870a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5603 9516 bytes