Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e820cf66a374b2…

MALICIOUS

PDF

33.1 KB Created: 2020-08-05 10:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39a5700242fa14f8f16a4c7c040b08da SHA-1: 588afebb3202d74fc48d1ea8c181a7504f502009 SHA-256: 96e820cf66a374b281c631aa7a9a04c2491ac2f6c63fcff96d1dd9794e07c1d7
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains embedded links pointing to known malicious redirector infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, and the document body was largely unreadable binary data.

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=gilbert+castellan+pdf
    • http://files.bankleysplumbinginc.com/uploads/1/3/0/7/130775011/zewuno.pdf
    • http://files.touchedbynangel.com/uploads/1/3/1/3/131397996/3838847.pdf
    • http://files.gawaterfalls.com/uploads/1/3/2/6/132695418/resixoxuvagafak.pdf
    • http://waraj.jessicamilne.com/uploads/1/3/0/7/130776257/2361235.pdf
    • https://cdn.shopify.com/s/files/1/0435/1492/1112/files/76055065464.pdf
    • https://cdn.shopify.com/s/files/1/0435/5578/2817/files/50968251535.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/90124839614.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/71444031548.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/79000153873.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8182/files/14783583457.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2517/files/john_deere_z225_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/area_of_circles_and_sectors_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/51519214784.pdf
    • https://cdn.shopify.com/s/files/1/0428/7712/4764/files/95558497486.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_off000048ef.bin
4ccd519c49d4c1eec281a49565c2348821909d5e9edda3d92faf968d3aa6fda1
pdf-font-stream PDF embedded font (sfnt) at offset 0x48EF 5320 bytes
font_01_sfnt_off00005b12.bin
1d98dfc5de85ad307dc312015db108f38f7eb416cdbe845171b615fe4f67c1fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B12 8396 bytes