Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e70c24b3f7c49c2…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 13:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12c71909c19b338eaa90ce0bb9aa42e1 SHA-1: fb3c8437897040495b9dbfae796c8ce3d3e240dd SHA-256: 3e70c24b3f7c49c219e33f7d6d84dc419bdf15b496394b646319c12fcae4ce95
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=jumble+answer+for+oct+12+2019', which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external documents, suggesting a coordinated effort to distribute malicious content.

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.club/wix?keyword=jumble+answer+for+oct+12+2019
    • https://static.usrfiles.com/ugd/b8c837_fb3e26e588d44a439b6545c18e965d58.pdf
    • https://static.usrfiles.com/ugd/b8c837_462d9dc08201408b9c21468378a80ddd.pdf
    • https://static.usrfiles.com/ugd/e643da_9969427e13454cf8b850a2ede13a60f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5499a6254b394d6bad834e2fde2732b3.pdf
    • https://cdn.shopify.com/s/files/1/0438/3647/3501/files/58787156219.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5264/files/favozovepakixepuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/pregnancy_congenital_heart_disease_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/3667/1132/files/pillars_of_eternity_cipher_class_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_78b162e72da3437086b193559b6a6bf9.pdf
    • https://static.usrfiles.com/ugd/0e2875_02f55bf73d984dc2a3d011d4641f703c.pdf
    • https://static.usrfiles.com/ugd/49be48_c67ddfc424854beaba17abe7a1803eab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/9804634466.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/22023417084.pdf
    • https://cdn.shopify.com/s/files/1/0434/8480/7334/files/artikel_budaya_jawa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eea.bin
fafd61efe2d450c5bcdbc57da90ab5d0c2ec65b3c60f0e0ecaed2c6ce2099ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEA 5564 bytes
font_01_sfnt_off000061c9.bin
8f4eeb19ff82ccbdbf44896383aef8630bb20dc0039102897ad3bb05bad1c0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 3756 bytes
font_02_sfnt_off0000707e.bin
d9b6a75d371653d17d77c2f2a9a5f22d6b804b0a77c789383788f6051e7d2295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707E 10356 bytes
font_03_sfnt_off0000939d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939D 4324 bytes

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