Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa030f8f3f3a5f8…

MALICIOUS

PDF

44.7 KB Created: 2020-08-02 16:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c40a7fc3e0890ee15a99ac8f6728e7 SHA-1: d1cc9fd8f2d252729690edd37cade96ded419625 SHA-256: 6fa030f8f3f3a5f81a2dd1a69a93aed370c5a06f32d436a88d5a1b84cfea513b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic indicates that a link within the document leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered this heuristic, suggesting a lure to external content.

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.cc/pify?keyword=hansel+and+gretel+short+story+pdf
    • http://files.jjesmerarchitecture.com/uploads/1/3/1/8/131871740/b927d6f.pdf
    • http://files.pcarep.com/uploads/1/3/1/3/131380175/kalubupiwetap.pdf
    • http://files.bonsaiphilippines.com/uploads/1/3/0/8/130874382/temifikidavunixad.pdf
    • http://files.lanzaroteboathotel.com/uploads/1/3/1/3/131397927/6b7afc8e.pdf
    • http://files.jfransfarm.com/uploads/1/3/2/7/132710748/9410528.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/rezunevizefudebexojeboj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/76857101112.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/god_favored_me_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/62494583084.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/emojis_copy_and_paste.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/74196340681.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/tekajoveduxaxit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/rojal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/77160595833.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2033/files/nefasakezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/rudero.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6296/files/62443457653.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_off000070e9.bin
4ac23b357e6fd4f0bba6ce12fd843b03989b71e7013e2f84913529f8cf2a5fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E9 5368 bytes
font_01_sfnt_off0000832c.bin
6cf0c0206ea6487cd552e33ba35e43d0c295cac898dfe04d2562b66d52f5a49f
pdf-font-stream PDF embedded font (sfnt) at offset 0x832C 9568 bytes