Malicious PDF — malware analysis report

Static analysis result for SHA-256 5053824e7ce07e73…

MALICIOUS

PDF

71.3 KB Created: 2020-09-10 02:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3a0b307ab0d92d113d0b9735224b93 SHA-1: 0020ac0470343ba6838d6f342ce2f6ecbbd9fc1b SHA-256: 5053824e7ce07e73368e280da7c9e9ef45207bd32bc1cbf3eb8aa367235bf065
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=dota+2+auto+chess+economy+guide'. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=dota+2+auto+chess+economy+guide
    • https://static.usrfiles.com/ugd/c2007e_f10862826d9843d58e7c5bd0b267d24f.pdf
    • https://static.usrfiles.com/ugd/158fb9_f6e52657a04b43e99f409c7405c1d152.pdf
    • https://static.usrfiles.com/ugd/e80f4c_f68db833ea24412cabbf90ad12f51295.pdf
    • https://static.usrfiles.com/ugd/f967ac_f37bb44639834f359bf3276e27fa83ec.pdf
    • https://static.usrfiles.com/ugd/0f1814_ced34eb3b3914248816b5450e4d40b3a.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5312/files/vakamun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0199/files/laravel_admin_template_bootstrap_4.pdf
    • https://cdn.shopify.com/s/files/1/0470/6176/2216/files/already_just_yet_still_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6268/files/53889447080.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/89304479508.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5548/files/bowikopax.pdf
    • https://cdn.shopify.com/s/files/1/0439/0646/5947/files/75551129789.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/sedozapupezoxupimes.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_off0000acb7.bin
63736a3152caed096851861222db2c1a85104b2d1c2e3cadd47ae70bbcfb6c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB7 5340 bytes
font_01_sfnt_off0000beb5.bin
1fc12a375bcc3be3bb541ba0d2e75a9deb76d5cd30a42549199b3ff9798c8b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 1892 bytes
font_02_sfnt_off0000c7d5.bin
8dbd761b167e805dedbf41530fb0e41c8a01c53f6c8340593119ff4a03a405fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 10592 bytes
font_03_sfnt_off0000ec3c.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 16092 bytes
font_04_sfnt_off00010103.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 4324 bytes

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