Malicious PDF — malware analysis report

Static analysis result for SHA-256 871514fd8ddd3036…

MALICIOUS

PDF

51.5 KB Created: 2020-09-01 07:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e7872295c27ac797099a1d2f40829a SHA-1: d9a67306910d5602698520eea485593044bbbb9b SHA-256: 871514fd8ddd3036065ca48a44630292d3f43d6edddc59b6dc4c30b0adaafe59
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, one of which is also listed as an IOC. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious URL. No scripts were extracted from this sample.

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/wix?keyword=dangling+modifier+practice+worksheet
    • https://static.usrfiles.com/ugd/738632_99b40a3982154050bbc1cd74c65c085e.pdf
    • https://static.usrfiles.com/ugd/bae363_6ec1985da4c345cf848cff45de8020f6.pdf
    • https://static.usrfiles.com/ugd/61b8bf_f7dbb1bea5674ce1b499d65175b59d16.pdf
    • https://static.usrfiles.com/ugd/87a178_adf6dde879bf4c44bfad0d8b04878982.pdf
    • https://static.usrfiles.com/ugd/cf14a4_40e189a658cf4d9f8fb4ac869dbd73f2.pdf
    • https://static.usrfiles.com/ugd/c83fdb_977c953e4bd4456e9174004b4fb09657.pdf
    • https://static.usrfiles.com/ugd/df73ab_c18a2ca848394a0a9ce6beb957a5f578.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_2d04927a75fc49b1b2389795a30b61f7.pdf
    • https://static.usrfiles.com/ugd/01e791_66246209d1da46c8be66fb2f58752378.pdf
    • https://static.usrfiles.com/ugd/7c30af_c9efe09cbc6e411cac936ec6b342e1f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cfe5a9e99e744bb962bd9832dc66cee.pdf
    • https://cdn.shopify.com/s/files/1/0433/5022/9160/files/aditya_movie_audio_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/19993746760.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/90369074894.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009641.bin
f5ea352d36a94a6f552e4062566ad86dd5a19df0113d467b90cc8c412f2c5974		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9641 18136 bytes
font_00_sfnt_off000060a6.bin
91953903d6c257c642018ec2f89ab94a8c645c591f98e21eb7c6968376f5fea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 5512 bytes
font_01_sfnt_off0000734b.bin
8513086ce3eac74f89242ab27ab6843d89ec8a53b2a93a149510fb86a66be8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734B 10156 bytes
font_03_sfnt_off0000b237.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 4324 bytes

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