Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6d862857ed6dd8…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 07:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c6d7921cdf05c75ba47d0456f7859a SHA-1: f76f6f7a3a80517bf9b059a1f18d905160e543d7 SHA-256: fe6d862857ed6dd875c4f0d7d35a5c47f65e6b452dae9378bd359eb045323998
154 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with many links pointing to benign Shopify URLs but one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Rental application form pdf' and the malicious URL 'https://ttraff.cc/pify?keyword=rental+application+form+pdf', suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=rental+application+form+pdf
    • http://files.wolfeboroinn.com/uploads/1/3/0/8/130874238/sodepuwe_nerugam_junogibeje.pdf
    • http://files.devlindesignstudio.com/uploads/1/3/0/8/130874246/ritufuzaw.pdf
    • http://files.lisarowlandsconsulting.com/uploads/1/3/0/7/130775331/c1c1aef1b.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/lil_uzi_erase_your_social_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25346701784.pdf
    • https://cdn.shopify.com/s/files/1/0434/3198/5309/files/nerofasakebozexisalubog.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/35330012014.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/dekelezevug.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/fuluwotuzakexurojefof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/62615938357.pdf
    • https://cdn.shopify.com/s/files/1/0438/4456/7197/files/artificial_intelligence_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0434/6786/6278/files/canon_in_d_violin_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/water_resources_engineering_mays.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/moroxobesovedorarepogud.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_off00006217.bin
53fc758dc299befd429174dbd4614b79a63b21ffbf276d7b0ef0bb935024c354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 5132 bytes
font_01_sfnt_off0000737f.bin
98ac3c327124eaf8f0c2ae4015b725be8f1564ff0a0e0155a19abbaf68c14ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737F 10232 bytes
font_02_sfnt_off000096cf.bin
64d8c22c8d37e77389ba11168dc19ee95ec2be9b4471c069115bb8f89ef30eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CF 3060 bytes

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