Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0a7dbe09861a35…

MALICIOUS

PDF

38.9 KB Created: 2020-08-17 01:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def810f82b4a27cfe13b07ba4811d005 SHA-1: 041cbdfc5f87e7d849868265371f042ec04a9b8f SHA-256: cf0a7dbe09861a350cc0e2b03e0671f7580973fbcf8454b2fc7f2d29880897e8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.com. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the PDF is designed as a link farm to distribute malware or phishing content, leveraging the song lyric lure to entice clicks.

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=cheekati+gadilo+chitha+kotudu+naa+songs
    • http://files.skyleslawfirm.com/uploads/1/3/1/4/131437513/xovufivunexen_zeletenilum.pdf
    • http://files.kinddesignsbyvalentine.com/uploads/1/3/2/6/132681647/7751407.pdf
    • http://wufejot.integratedhealthcare.ca/uploads/1/3/1/4/131482995/b346f4e8968ee.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/pectoral_region_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/4770308744.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/25563925729.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/despacito_lyrics_download_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/40443730747.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/4869852159.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/bidusovolugovodixov.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/49680165591.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0487/files/56080760778.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/chloroformic_acid_benzyl_ester.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/logifaguzepojiwez.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_off000050ad.bin
b1dbf92750e2a2605eec6d5ca46f66290d8c11673eb5ffdce868dd0e0ea339eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x50AD 5072 bytes
font_01_sfnt_off000061ed.bin
702c2089a9e2dc31905cd63b8583cadc7239106142b11f9c36973ca9f5375ee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 14604 bytes