Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e885f8c47cb09ff…

MALICIOUS

PDF

51.7 KB Created: 2020-08-30 21:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa811cccdd52c92b6ff357c261f96180 SHA-1: 23f8c697e914bf84f8d2abbba219bb11b2a80198 SHA-256: 5e885f8c47cb09ff4a26e8de9cc2a8c764d184da2d78920f13f77748ae737afb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=2011+amc+12b'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are to benign-looking PDFs. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains the same malicious URL and a reference to a PDF link farm.

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=2011+amc+12b
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/353d00_eaa4fa9e222e4270b0223c202d211a10.pdf
    • https://static.usrfiles.com/ugd/b8c837_a275e4d28f764478b9dd137a609f409c.pdf
    • https://static.usrfiles.com/ugd/f4de5e_8bc7849e71974d3eb903aafaadec2ed0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e866402209b4a83b948a68f0bf0a07d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e780cae277274c0987c10f515369a3e4.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/70743587462.pdf
    • https://cdn.shopify.com/s/files/1/0435/1252/9055/files/62975790186.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/sony_walkman_cd_player_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/58905410515.pdf
    • https://static.usrfiles.com/ugd/b8c837_246c0046a4ab40f8b875618f3232a841.pdf
    • https://static.usrfiles.com/ugd/b8c837_6946d38991dd4992b14f681500e3a028.pdf
    • https://static.usrfiles.com/ugd/930050_f025346fc4bb453783a4f0b0ad9626c5.pdf
    • https://static.usrfiles.com/ugd/9c43ec_44482982983e4e66a2e4893e2813749d.pdf
    • https://static.usrfiles.com/ugd/6116da_92c7b648e9b84e35ad3fccfd4c275797.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/saving_throw_proficiency_5e.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5189/files/texulufoniroguga.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007078.bin
57eecee6a3fbef2cc05235d6f7030e1efed81878a8de13f900a8ec900b50985e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7078 4732 bytes
font_01_sfnt_off000080f8.bin
0c87661993e821ca259db2dd6727c063b165b84a9f54f519c147e03382c3d662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F8 4336 bytes
font_02_sfnt_off00008f99.bin
eafba9ade3d32b762584b1d9506d9b5e36a398ca872e1aa340304a8887bd8424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F99 10180 bytes
font_03_sfnt_off0000b268.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 4324 bytes

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