Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a078b956cb8c90…

MALICIOUS

PDF

51.1 KB Created: 2020-08-05 14:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2233ee9b0bcce0e89f86460923140119 SHA-1: 339127a780b79929db558b8f03783357d0a434b9 SHA-256: 15a078b956cb8c9060423de8f1836d61f36033cafb81ddd6dbecbd6d5544afcb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'CDC pediatric immunization schedule pdf' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=cdc+pediatric+immunization+schedule+pdf
    • http://vopixinux.cottonwoodhoops.com/uploads/1/3/1/4/131408024/65dbb18f3.pdf
    • http://files.kgreggartist.com/uploads/1/3/0/7/130776769/nadevaze.pdf
    • http://files.parkcitybrewery.shop/uploads/1/3/1/0/131069875/647518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88065476392.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/4297955528.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/5861998105.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/91430705567.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/awaken_the_giant_within_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/fulojol.pdf
    • https://cdn.shopify.com/s/files/1/0434/9178/6918/files/20848249992.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/33864422532.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0434/8231/6957/files/pilejazijipupukilif.pdf
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/41252414583.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/8084780266.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a5f.bin
5bdec63e345a2d5786a311312a94b6a0ed6a0edd92a0860bdf2764106d571ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5F 5352 bytes
font_01_sfnt_off00009c6b.bin
dab81fc8e390c6e329e73c8cf8b9844989a89281f4888a46d7e15c5e77a1c319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6B 10104 bytes

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