Malicious PDF — malware analysis report

Static analysis result for SHA-256 508158f55cc6b4e3…

MALICIOUS

PDF

57.3 KB Created: 2020-08-31 18:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0f9de04c51def27fb4a176e4ca1771 SHA-1: afe8afd1c3d8266a3df2f13cad43d6c53da71b1a SHA-256: 508158f55cc6b4e390405374ca369e9cc2dca48371233477782e5f1308b0e78c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially obfuscated, contains the phrase 'Library search strategy worksheet' and the malicious URL, indicating a lure to a malicious redirector.

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=library+search+strategy+worksheet
    • https://cdn.shopify.com/s/files/1/0432/3082/2555/files/16848508320.pdf
    • https://cdn.shopify.com/s/files/1/0457/7525/7756/files/multiplying_and_dividing_monomials_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/bonafubidugib.pdf
    • https://cdn.shopify.com/s/files/1/0438/4024/1829/files/26807989439.pdf
    • https://static.usrfiles.com/ugd/5b9365_a1b42e626ea74738a2eab974f587eb54.pdf
    • https://static.usrfiles.com/ugd/87fdc7_ef0bb7307bac46a8953af3999c7fc232.pdf
    • https://static.usrfiles.com/ugd/32acb1_aced01cd2d944494b3757e7202e6e913.pdf
    • https://static.usrfiles.com/ugd/ce77c6_c5eaf1ec4fdc4407a5807aac59909dde.pdf
    • https://static.usrfiles.com/ugd/b8c837_50f07d5ac3c04be4a92b94ca5ad66941.pdf
    • https://static.usrfiles.com/ugd/affb4a_52838444c864451a9ed68d657a2d94ce.pdf
    • https://static.usrfiles.com/ugd/e2f197_aea88a14190345709859744832c5a2fb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/jotuwejemogubog.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/68291802112.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/baixar_livros_em_gratis_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/30_variety_rice_in_tamil_language.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/xebewukufasepalunigika.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_off00008344.bin
b8b5d2915e219e1e39e4725926b8f07172f15df9dba7f87e49379411d9aacf0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8344 5048 bytes
font_01_sfnt_off00009490.bin
efbd1a21f64b09be235b1e824ea2c7fca94746548d34e015076fb5d68a01e55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9490 6376 bytes
font_02_sfnt_off0000a554.bin
dcf00306001279efc839e084e8c7de8aac4ae738d6b9e18568bdf148242107d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA554 10500 bytes
font_03_sfnt_off0000c931.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 4324 bytes

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