Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a281d0dac30b7b…

MALICIOUS

PDF

46.5 KB Created: 2020-07-30 14:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a2ce25b9018cb065f520588b86723d0 SHA-1: 34bc0b1ae8d9384e710a81aba494fbca08a3e1c3 SHA-256: 56a281d0dac30b7b0b84c9b741f91f4253096bbdde0ba6b16eaba206e4b40eab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure for 'interior design pdf free download'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.com/pify?keyword=interior+design+pdf+free+download
    • http://files.wwii-women-pilots.org/uploads/1/3/0/8/130814229/femabezoginijivuxe.pdf
    • http://files.thehollywoodhoosier.com/uploads/1/3/0/7/130739399/dinaratox-gametiminonugox-vogukoz.pdf
    • http://files.cleansteamusa.org/uploads/1/3/0/7/130739288/2290782.pdf
    • http://files.dayschoolgarden.com/uploads/1/3/1/4/131453706/e88ff777.pdf
    • http://files.tre-pta.com/uploads/1/3/1/4/131437246/704e2a292db.pdf
    • http://files.wwii-women-pilots.org/u
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/kexapofitogevunejom.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0328/files/peremizisupim.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/26758831897.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/52431539237.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9267/files/36455980974.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/16269065197.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/27927429616.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/famozuguvatutobonetutave.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2645/files/85341743658.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/viwobufakuma.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/55562574297.pdf
    • https://cdn.shopify.com/s/files/1/0440/3698/0886/files/19462857136.pdf
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/89963632224.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_off00007904.bin
d1e3b52a2868ab7c7b5459cf6d11cc639869b6fb229c62637d3cd08f350ec265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 5024 bytes
font_01_sfnt_off00008a36.bin
b560f1f44cdd59105d26eb28cb0372f2b4cb8936afdd40bf96e58c718c957827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A36 10028 bytes

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