Malicious PDF — malware analysis report

Static analysis result for SHA-256 346acf7b26e653d6…

MALICIOUS

PDF

47.0 KB Created: 2020-09-06 23:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260701c6cd6f8fcc2358993b54eb917b SHA-1: 6fa2c40e54141253db0abbc579194f3f7fe51446 SHA-256: 346acf7b26e653d6ddfed2ee57caa9721bd18b9e58285c2795eb176565c331f0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body itself is heavily obfuscated but contains the URL 'https://ttraff.link/wix?keyword=bucket+list+full+marathi+movie+2018', suggesting a lure related to a movie. The PDF also contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO poisoning or to host further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=bucket+list+full+marathi+movie+2018
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/arrl_antenna_book_23nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/64362018517.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/ledixojagamude.pdf
    • https://static.usrfiles.com/ugd/eb4c03_5b85e2bfc9b84f2ab05a18d244b56265.pdf
    • https://static.usrfiles.com/ugd/02beb7_a989518a89374a4e883a2f08cd8d914c.pdf
    • https://static.usrfiles.com/ugd/3be3a7_ffc8e21c5bf24dbd829577399d0d3f7f.pdf
    • https://static.usrfiles.com/ugd/856cea_f4d1d2c87f514e92a5a38569cfdac14f.pdf
    • https://static.usrfiles.com/ugd/15cd4d_7bbd76eddfe3428b847bd2937d990284.pdf
    • https://static.usrfiles.com/ugd/a4e402_f4b4ee2be357427eaac2bab4bdd9ee4d.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_dbd0173a5f7f49aebe7a34949b38c487.pdf
    • https://static.usrfiles.com/ugd/764aaa_6f368b951810481cb4f43fe217ebc79c.pdf
    • https://static.usrfiles.com/ugd/b88e3d_54a6f7008f684afcb2c8b1f47ea13add.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/nagunosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/kapajul.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/sozubipex.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2091/files/46082740591.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_off00006281.bin
a71b0b4b2f6331f45cf5a09c325f071fc6e8fb398dd3e406cd2eb7d7b5e475d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6281 5816 bytes
font_01_sfnt_off0000762f.bin
ffaf13e0f88babce78937e5ae5cbfb4c908a1454542b756bc0aa423410ea7c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762F 10264 bytes
font_02_sfnt_off000099ae.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AE 16164 bytes

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