Malicious PDF — malware analysis report

Static analysis result for SHA-256 1210f39faf01798d…

MALICIOUS

PDF

54.3 KB Created: 2020-08-30 02:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26b35d04eefa285a7a53d8ddba36c8f5 SHA-1: ee9e4a0ecf4f17a71112cde8246e6d3127634697 SHA-256: 1210f39faf01798d61ed80b8e19abc23f4081d7af6c3208e92a05eb1be83ff35
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'castle crashers character unlocks' and a URL that matches the redirector. This suggests an advance-fee scam lure, aiming to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/wix?keyword=castle+crashers+character+unlocks
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9757e7_2daa90dc33f446d6a2243afef3f433e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_019096de12f24e95a47cbc0fdde67012.pdf
    • https://static.usrfiles.com/ugd/b8c837_72114670a1974d5293f12dccec51f90e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbe3e27c4de042d8b924d2f59be0f480.pdf
    • https://static.usrfiles.com/ugd/c7a620_a115f73bd1084f39981b04fb9ba18e89.pdf
    • https://static.usrfiles.com/ugd/77eba6_341c88dcfb9b4a43815e89ac7d4ba206.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/kofudezezapomubazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/morfologia_artropodos.pdf
    • https://cdn.shopify.com/s/files/1/0462/3961/3079/files/bubbles_png_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7957/files/genetics_by_pk_gupta.pdf
    • https://static.usrfiles.com/ugd/b8c837_47ed1d55a9c145b7b49bbec8d3f826c9.pdf
    • https://static.usrfiles.com/ugd/ca32a8_f3bf678c3c914cc89634fc664ae84bd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9e6cca9d402468cb8d9920b47403c0b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089bd.bin
5c6f483d338254d9b3aea2847b582be72f5d06cac1be462407d9591c9a249b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BD 4808 bytes
font_01_sfnt_off00009a04.bin
592c5218ecc94a07b14b7de0c0e0cac22392f63122c873ef07892290e931f41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A04 10512 bytes
font_02_sfnt_off0000bdf8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF8 4324 bytes

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