Malicious PDF — malware analysis report

Static analysis result for SHA-256 957c49a6d873f068…

MALICIOUS

PDF

49.1 KB Created: 2020-08-30 07:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5a68774c2bdf82d01dec053c917ebe0 SHA-1: 3aa373cd2046d6b3e9823a9e61686b47f59aa6a8 SHA-256: 957c49a6d873f068f36188ec7da252dcc7a4ea6c7457a1a501b53c251243b809
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=crafting+feathers+skyrim, which is likely the primary malicious payload delivery mechanism. The file also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on cdn.shopify.com.

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.me/wix?keyword=crafting+feathers+skyrim
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/bedijerowijekoxibaluk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/letisepofuzaziniga.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/30823554643.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/desagavorobapepatu.pdf
    • https://cdn.shopify.com/s/files/1/0470/9515/2798/files/22764431265.pdf
    • https://cdn.shopify.com/s/files/1/0440/4638/5317/files/fegozuzamifubawedonikow.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/vepugomipaxixipeziji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/rolufonuvusil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/tamelesikodewejaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/zimajuwapow.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b2ea211f6774780906f6e8b7e9151f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_79db1b3cedb34562867ac8531568f8aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_354a95618d324d27ae6063bcd34cfe0b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007635.bin
e3e797ff50077ce4f10fa928a5e788b068ac0e4fb5208681fc73ed74e1c64d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7635 5016 bytes
font_01_sfnt_off00008716.bin
ebc05bc857eda1a5697a42db7a523b706aa15d0af76202621f6df54ff0be746b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8716 10060 bytes
font_02_sfnt_off0000a989.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA989 4324 bytes

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