Malicious PDF — malware analysis report

Static analysis result for SHA-256 08779340a795b761…

MALICIOUS

PDF

41.0 KB Created: 2020-09-02 01:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 890172ea14a34af0be3af3c1237bcb2b SHA-1: 2038df2933ac7385f03e5918c5f930aa80853563 SHA-256: 08779340a795b7617ea46bbc5fbea511687931bb6eb936ce0532e0e131e3f080
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, disguised with keywords like 'ccleaner piriform italiano gratis'. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm used for SEO poisoning or distributing further malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to a malicious URL.

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.link/wix?keyword=ccleaner+piriform+italiano+gratis
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_60dc015ac09b45b9bad1647d7fa67711.pdf
    • https://static.usrfiles.com/ugd/4f92c1_10dc444dd89e433c80479499e84a2e43.pdf
    • https://static.usrfiles.com/ugd/e8506d_f5a71bd38dc046868d9a8b4bf99f267f.pdf
    • https://static.usrfiles.com/ugd/7d21c0_2a179642ceae4a008692e9eca0008fad.pdf
    • https://static.usrfiles.com/ugd/b8c837_eeeec7059f2c46c69f5ad0e5a6696a2e.pdf
    • https://static.usrfiles.com/ugd/de60da_223d150f145640de9b7fe71b7f3a211d.pdf
    • https://static.usrfiles.com/ugd/ea78e0_d3944a4a68f04dbbb7a179ac3c2bc8c0.pdf
    • https://static.usrfiles.com/ugd/19ce5d_82f9797220a540d8af309822581bffa7.pdf
    • https://cdn.shopify.com/s/files/1/0462/3810/5749/files/present_ministers_of_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0464/7242/9718/files/deleuze_el_bergsonismo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/30150899210.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/86126780693.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/google_sheets_count_characters_in_column.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/43016487476.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000637a.bin
6073587bd4b680dec96c06bca47bbe0988ca31143cede9791e691865044194b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x637A 5240 bytes
font_01_sfnt_off0000753a.bin
8eb280e292908634a34f520ae6cf94970d250559898b78801b94190e06c5a3f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 10004 bytes