Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1432546e7697eb6…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 03:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27544683a2e28e15097685319ae36a48 SHA-1: 751c997e5dea84a6a9ff1e6414d455f9d7c19ca5 SHA-256: f1432546e7697eb6654d969e936b51eb537d82ecd47e6182fba2a988e826a032
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a PDF link farm. One of these links, https://ttraff.cc/wix?keyword=chamomile+extract+for+skin+pdf, points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious content or a phishing page. The ML classifier strongly supports the malicious nature of this PDF.

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=chamomile+extract+for+skin+pdf
    • https://static.usrfiles.com/ugd/b8c837_46ba6182436e4eddb7f5e135cc2b47a3.pdf
    • https://static.usrfiles.com/ugd/c836c3_b36ef76b6c5f445a85eaf4de3a2610d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8ac8470e0cb42a2a898a88c7b77eccc.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/55053403153.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/1538629578.pdf
    • https://cdn.shopify.com/s/files/1/0444/3389/9686/files/biology_campbell_reece_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/4391/7719/files/nios_albinos.pdf
    • https://cdn.shopify.com/s/files/1/0437/4003/7271/files/33691090887.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/livimonebovutibisirana.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/23777778850.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/welcome_address_speech_in_english_format.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/pudapenuwaleb.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_off00005f4c.bin
c4003b8543799c336fa5660524baa9c9002ddc45eab05417ef68c55c0754fe05
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4C 5340 bytes
font_01_sfnt_off00007156.bin
6eb3caa3522341041dedf2fe432ddcdf9f52de57ce7bb291f72c03a3a53a7c03
pdf-font-stream PDF embedded font (sfnt) at offset 0x7156 10376 bytes
font_02_sfnt_off00009477.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9477 4324 bytes