Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed769212ee5e6ac9…

MALICIOUS

PDF

54.7 KB Created: 2020-08-10 04:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2ed78f5097e460ed84d9074b6646b2 SHA-1: 65474eec98a774de57555e0621f93d1b63c5502c SHA-256: ed769212ee5e6ac990098fd9a6e09e7edfe2a65a585b4df9ecee5a736e98279b
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, many hosted on Shopify, designed to obscure malicious destinations. One critical heuristic identified a direct link to a known malicious redirector, ttraff.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and several other URLs that appear to be part of the link farm, suggesting a delivery mechanism for further malicious content or phishing attempts.

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=les+acides+nucl%25C3%25A9iques+pdf
    • http://files.alliedanklefoot.com/uploads/1/3/1/3/131379748/2b62b3f4683b.pdf
    • http://files.jamie-carl-design.com/uploads/1/3/1/8/131856146/4134798.pdf
    • http://gagorof.bearlakeregionalcommission.org/uploads/1/3/0/7/130775162/d7cbcccb.pdf
    • http://files.saskstealth.net/uploads/1/3/0/7/130740320/karelenawe_jegedem_kexusurabirupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/buxofibireda.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/60495438555.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/38420998754.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/jquery_change_background_color.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/like_button_youtube.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0651/files/dictionary_free_download_for_students_learning_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/aluminium_casting_defects.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/jolunizepizivep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/2552608715.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_off00007c44.bin
7055b0ba3cdcae9e78ee4596daa6baddf84d2251bd1e611089ab6d04d275645b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C44 5260 bytes
font_01_sfnt_off00008dfb.bin
401b61abeccb5d65ff076bd707d888214bb4bcee78c128d63c8f5134ff831f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFB 11916 bytes
font_02_sfnt_off0000b459.bin
6f848e939c06383dd4632136fa8c4ef3ca52f138aaf6ef5d5052ff41c559c0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB459 16760 bytes

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