Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba720367fbfed72f…

MALICIOUS

PDF

48.9 KB Created: 2020-08-04 22:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1594c580cefa90618b87990f124c9380 SHA-1: 1c8764e863bb8a03a1f3e59d732150bf71c7ccad SHA-256: ba720367fbfed72f51c9e557013c03d85b121e2115808bd928c87d20644e5125
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded links, identified as a link farm, with one link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though malformed, contains text related to 'algebraic expressions worksheets for class 8 pdf' and the malicious redirector URL, suggesting a lure to disguise the malicious intent. No scripts were extracted from this sample.

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=algebraic+expressions+worksheets+for+class+8+pdf
    • http://files.jasminrobinsonpo.com/uploads/1/3/0/8/130874316/68928.pdf
    • http://files.phantom-photo-fixers.com/uploads/1/3/1/0/131070035/df22b3e6e2.pdf
    • http://files.waistgame.com/uploads/1/3/2/6/132683328/e6434717278f1.pdf
    • http://files.dawnssparklebox.net/uploads/1/3/2/8/132814929/2b4eb74e4fe22.pdf
    • http://files.rainworkskenya.org/uploads/1/3/1/4/131454523/fetolumaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8918/2376/files/gupuxabejidufuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/wodik.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/sajagobokemewufawuliv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5900/files/wavelength_to_rgb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/90595107586.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/autodesk_inventor_tutorials_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevebetivegukubevam.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/1-_99_farming_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/nipudegaximugameba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/56367021592.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/vogibeme.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/7115937335.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_off00007596.bin
ea3091fca6631aa8f595104c5f94f22ef1afb59069575911114e6c6b7393489c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7596 5964 bytes
font_01_sfnt_off000089f4.bin
90354d718b0fd76ec2a38ada9172c77fc2d9cadc424b068733f62a2f6a048890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F4 13440 bytes

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