Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1f4544df8c75f0…

MALICIOUS

PDF

44.2 KB Created: 2020-08-02 23:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a55154b51a098d14167f48d0f527ba8 SHA-1: 915103dc3ba273d31c3f6e0d8c7d9ae0ad51391e SHA-256: 9d1f4544df8c75f06210e9df3939d2848c35fd26f4f313b5417cc1063fc29f57
152 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, pointing to 'https://ttraff.cc/pify?keyword=xbox+one+instructions+pdf'. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Xbox one instructions pdf'. The PDF also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or content distribution network used to host malicious files. The ML classifier also 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.cc/pify?keyword=xbox+one+instructions+pdf
    • http://files.professorwillis.com/uploads/1/3/0/9/130969819/3536095.pdf
    • http://files.itsallabouttherealestate.com/uploads/1/3/1/4/131438500/6656761.pdf
    • http://files.cth75.com/uploads/1/3/0/7/130738719/pewotemuji_fabodo.pdf
    • http://files.fsasuffolk.org.uk/uploads/1/3/2/6/132695870/2420612.pdf
    • http://files.wakefulway.org/uploads/1/3/0/9/130969206/lujaresetaritulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/50387314271.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/57928596761.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/bavafotesisexenedovukon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/ledegifagepotazezele.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/kosaburolinizuromewewolup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/79878294833.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/jupuvirixuvipelulonener.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/bhat_br_modern_probability_theory_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/93703113136.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/54500195022.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/weviren.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/sofujenafuxer.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_off00006eb0.bin
b4296a1dd685ddc907247b447647d5e863fe156091ce07e97841cbb0f12eadf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB0 5092 bytes
font_01_sfnt_off0000800f.bin
182ef36b60656cf1949c8f912588c024ef96eb77d84b166b098a231dc12d71cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800F 10492 bytes

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