Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9b4ed7309504e9…

MALICIOUS

PDF

58.6 KB Created: 2020-08-30 16:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 846bac202dcff4e98ae974af3673e340 SHA-1: a576025b0d900b664666915636d8b4994d17fb4b SHA-256: 5e9b4ed7309504e964a5c8d58f8a17d81ad5c5a62c8fd60a8fd734f44b24f1c2
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference a '21 day fix calorie chart 2019' and includes the malicious URL. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or redirection tactic. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=21+day+fix+calorie+chart+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0435/8871/4653/files/thiruttu_vcd_movies.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/fogagurovesomirufebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/90672699354.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/kixewa.pdf
    • https://static.usrfiles.com/ugd/b8c837_786f21961f584894a3c225790d04a6a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f1e277bebc34e7587760691e32036de.pdf
    • https://static.usrfiles.com/ugd/b8c837_62e7d0fc78bf44aeb11db80e0ba0244c.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_73d6b86cf9c846ca9ee9faf00f8735cf.pdf
    • https://static.usrfiles.com/ugd/451461_83db59b08378419890a779f86db09b9a.pdf
    • https://static.usrfiles.com/ugd/122077_f1765373757a4dab8530c2a45457d513.pdf
    • https://static.usrfiles.com/ugd/c63dba_4510740f662d406780b890d5646e2919.pdf
    • https://static.usrfiles.com/ugd/b8c837_370d3142b2dd427b91091a4ecdfb54ec.pdf
    • https://static.usrfiles.com/ugd/efb3f0_cc0b363b7a2e4fdcac97089fe55253fc.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_06893a3f22a1475a9c41536ad48bafae.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ce9d8498b841539ece29581a757d95.pdf
    • https://static.usrfiles.com/ugd/b8c837_0498c0ee08044bf8bb70d73c57a1bc4a.pdf
    • https://static.usrfiles.com/ugd/33c377_7c9305b327974955970b7718521f0225.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_4aad8f31f4774ac8850d1f84a40d4fa5.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b32.bin
4f344570843af3aba25c8837af2f0e14aeacb0054e1b2fecbf9f4c43305e834b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B32 5488 bytes
font_01_sfnt_off00009dca.bin
7618bbf5de403fcd204ab144b12200cb711c9af92bacf0576ce62a051db2a6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCA 7836 bytes
font_02_sfnt_off0000b368.bin
694b5e3bff006368998998d56ea2bddd27dbb88a39ef4d160bdfd4b5bbf8481c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB368 12672 bytes

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