Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4883f46836bfc5…

MALICIOUS

PDF

57.3 KB Created: 2020-08-01 18:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2799b930ab9fd727efb06384db5a32e2 SHA-1: cd50962e040cbfa464e0526149ec08bce086afc5 SHA-256: df4883f46836bfc53dd559ca96344787b43c6e31ae29e5bff17fe9733e444494
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm infrastructure hosted on cdn.shopify.com. One of these links, https://ttraff.cc/pify?keyword=haskell+binary+tree, is identified as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking malicious links that likely lead to further compromise.

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=haskell+binary+tree
    • http://files.3d-knowledge.com/uploads/1/3/0/8/130814032/36a01fd7.pdf
    • http://files.lakesideassembly.net/uploads/1/3/2/6/132695492/4769832.pdf
    • http://files.whereyatseafood.com/uploads/1/3/1/4/131406688/6888414.pdf
    • http://files.marneltuckerpsyd.com/uploads/1/3/1/3/131398235/fituwokoxuzowi.pdf
    • http://files.obriennewsservice.com/uploads/1/3/2/7/132710711/noponatozuzivawil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/80918449551.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/21682403659.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/modexoboxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8225/1421/files/mudofanomarewurikotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/vexigijozilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/pototozalefitaxexawewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/38979912867.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/59608003872.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vonabubabosutogoxofe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/50436121395.pdf
    • https://cdn.shopify.com/s/files/1/0437/0661/3912/files/jebawuraxivekop.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/vadazorim.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/72686155076.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_off0000a3b9.bin
6f9b1a3c799740342c760351b39bfcb94ee7b2fd487f1086db22d97f8d1475b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B9 4944 bytes
font_01_sfnt_off0000b499.bin
da58ec5c46264786b425e2f126a5fbeff60af39891b00adf6030ed96d3ebf5a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 10968 bytes

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