Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac035cfe976f686…

MALICIOUS

PDF

47.3 KB Created: 2020-08-29 14:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d001b0e7fefdf304b306047b9e118737 SHA-1: 07978782d3c347483c1ea6d14b645608acaee819 SHA-256: eac035cfe976f6866b8c622ca1c8413d0089424fb7dc962b3e6a41ef61743305
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary redirector URL, https://ttraff.ru/wix?keyword=brush+calligraphy+practice+sheets+pdf, is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to lure users to malicious content under the guise of calligraphy practice sheets.

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=brush+calligraphy+practice+sheets+pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/starfinder_core_rulebook_errata.pdf
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/11595420942.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/jaravova.pdf
    • https://cdn.shopify.com/s/files/1/0433/5127/7726/files/65975141044.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/54657528724.pdf
    • https://static.usrfiles.com/ugd/b8c837_779f679d34cc4bf49bc449e7b4a11641.pdf
    • https://static.usrfiles.com/ugd/b8c837_288cb9325af442adb59e88c661e492c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f18cad06e041a6baedb4428c042c3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9a69bcc4ee8492594ddbdeac6519153.pdf
    • https://static.usrfiles.com/ugd/b8c837_54e43c52bc5a4431b151cd18dfaaa17e.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/10537848341.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/xanizagowubunolim.pdf
    • https://cdn.shopify.com/s/files/1/0437/6841/4370/files/nintendogs_best_freinds.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5104/files/czasy_angielski_wiczenia_szkoa_podstawowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/43186669751.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006459.bin
01f46e34351bd855af8bc0f399803a774692bc21a6b163a4192d8dfa5a29d7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6459 5568 bytes
font_01_sfnt_off0000774f.bin
fd4d527b6e0812568d186ee0d962d8fae3423262062d7228686df71ff1a0b286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774F 10304 bytes
font_02_sfnt_off00009ac1.bin
c197bfed83b2e13f84b61bb4629d0ff699160b3301e35826781b38ada9632661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC1 16192 bytes

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