Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bc8024147f7ca8…

MALICIOUS

PDF

56.8 KB Created: 2020-09-01 11:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6beabc018b2141764a76861d7379f7 SHA-1: dc011700aa308bc5d2b3dd93f593a799bb10350e SHA-256: 52bc8024147f7ca8fff35def6deb40dc249bbe6e9e3d0e191bc9f540fcd42fec
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the same as the one identified by the redirector heuristic. This suggests the document's primary purpose is to trick the user into visiting a malicious site.

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=management+response+letter+to+audit+template
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/sifitaroxowubimolokug.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/lefakezigejewezag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mikawewetekiwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/effective_java__github.pdf
    • https://cdn.shopify.com/s/files/1/0438/1310/9917/files/62825395044.pdf
    • https://static.usrfiles.com/ugd/ab059d_c5e160988d4749b7a2032b243794d4ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_128d2447e7e54244b1d2e2b62307664e.pdf
    • https://static.usrfiles.com/ugd/221f3a_d26b9e50e2f44d15babf0cd013e5795c.pdf
    • https://static.usrfiles.com/ugd/b8c837_78da9fabcc9d4a2cb9a8509cdee0d3bb.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/pinofekefomefevagonulok.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/69668250284.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fcd.bin
fcec94f7e471bfeb10f17c30408b03e67040abdd56782bb2b6cbb59e1d0dda86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCD 5284 bytes
font_01_sfnt_off0000b1ba.bin
07894a8be4fb47a7281745364674fbaec6c853541093b26f7efeaad97e214641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 10696 bytes

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