Malicious PDF — malware analysis report

Static analysis result for SHA-256 914f8f8889c10cdc…

MALICIOUS

PDF

51.3 KB Created: 2020-09-02 00:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c6b86cf9750572ab9a294ba3e5e6be SHA-1: fa9f2d31b2b6763fc9eddacf086de83398be156e SHA-256: 914f8f8889c10cdcc9640bdd2db43fae5d1f38eb9c441990f420734544c83a9f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a social engineering attempt to lure users to external sites. The primary malicious link identified is https://ttraff.com/wix?keyword=bass+boosted+music+mix.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/wix?keyword=bass+boosted+music+mix
    • https://static.usrfiles.com/ugd/1d64af_7123143a70664c10bcd842f49a620900.pdf
    • https://static.usrfiles.com/ugd/f967ac_5d76089f34b54d459a7440c83955cd55.pdf
    • https://static.usrfiles.com/ugd/48d9a1_4cc3104b48e745afa24364d452b5329a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d46dfc5edf7f4833a626abf19ee6e198.pdf
    • https://static.usrfiles.com/ugd/af0aa9_9a04e3ea23c94bde8fabda9218b44325.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/ladikalefuxilejuwavexitox.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/brush_lettering_practice_sheets_free_ipad.pdf
    • https://static.usrfiles.com/ugd/1813b3_491a52ccfef94acf93e664f1f952fbc8.pdf
    • https://static.usrfiles.com/ugd/f99735_80fc379a607645be8a32a326c8a4b3d8.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004405.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4405 6440 bytes
font_01_sfnt_off000053f9.bin
617d305b4a1743b5ad0999f3aeeb0b45e624b12650ac77382d5102ce1b74b126
pdf-font-stream PDF embedded font (sfnt) at offset 0x53F9 5212 bytes
font_02_sfnt_off0000659f.bin
672e4a2e70316abd90acc45a1b50bd54872b3a2d42d1a6de04c1c138f41b4c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x659F 2936 bytes
font_03_sfnt_off00007208.bin
a273d3aa0771d0cd4ab846cbae0b2b30a413ef4ad7f55c8b5994fa5067c72278
pdf-font-stream PDF embedded font (sfnt) at offset 0x7208 14804 bytes
font_04_sfnt_off00009fe5.bin
a6c1d0d3069795913c3a72cd44cb90af8d0662b9d4c3d694ddd00a057b37fcb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE5 18808 bytes