Malicious PDF — malware analysis report

Static analysis result for SHA-256 38772dc7587d86d9…

MALICIOUS

PDF

61.9 KB Created: 2020-08-30 14:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1f060eda1f15afc41bee466ef5404a SHA-1: c1aea6ec201bacced44289b135d02d8c01e6c8d5 SHA-256: 38772dc7587d86d9d8c9a6fe9b1bb7de4d4d430549f49b374a8cb738f73e6403
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, masquerading as a Minecraft APK download. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'minecraft apk' and the malicious URL, reinforcing the lure.

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.ru/wix?keyword=14.+0+minecraft+apk
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/wanomewawufijisodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2033/files/xaxilomewekid.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/bireritaruverow.pdf
    • https://cdn.shopify.com/s/files/1/0438/5266/0901/files/famoki.pdf
    • https://static.usrfiles.com/ugd/7dd30d_12c756b507bd4a3c98c79de91f29415a.pdf
    • https://static.usrfiles.com/ugd/22739b_ce1bbe804c8e4775b56b6e5522e7ea8d.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4069/files/67597669841.pdf
    • https://cdn.shopify.com/s/files/1/0437/3023/9637/files/vevudanorawexodiravoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/midemalevi.pdf
    • https://cdn.shopify.com/s/files/1/0461/9026/4469/files/90346099318.pdf
    • https://static.usrfiles.com/ugd/d1d005_639c300b71bc4304b3f2508d3ff21d8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_244c20871d254709ae39f38d64059956.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_off0000b569.bin
a20b61910ccffe1d862f5c948d12ed3c5cd66de71858ade2d0035112520bbf18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB569 5236 bytes
font_01_sfnt_off0000c722.bin
2a61a847accf9ecabaed67a798169b339140c0573c0b5933c80575720be358b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 10420 bytes

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