Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fb1e7b6c4d2c7b…

MALICIOUS

PDF

39.8 KB Created: 2020-08-17 11:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204270e987c8dc5a9760d3c72bd750e6 SHA-1: a5f4a1d17c080942472782e5539f53cb457b01a2 SHA-256: 02fb1e7b6c4d2c7b5de77179beb470fefe22811167074d534e1b74da2ad2b696
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'grade r life skills worksheets' and includes the malicious URL, suggesting a lure for phishing or malware delivery. The ML classifier strongly supports the malicious verdict.

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=grade+r+life+skills+worksheets
    • http://katudoda.doublesmedia.com/uploads/1/3/2/6/132696483/faropixebona.pdf
    • http://files.jiahjuice.com/uploads/1/3/0/9/130969754/kosedaluv.pdf
    • http://files.k8willard.com/uploads/1/3/2/7/132740352/9247039.pdf
    • http://files.instantresultswithkate.com/uploads/1/3/1/3/131398555/b44aeae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/noblesse_oblige_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0120/8232/files/75313423669.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/26158214551.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/sarezamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/samodunamibudaxutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4181/4693/files/lezerizegulidese.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3865/files/67876832482.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/vesaretibisexogumavanoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/dolesepasixiri.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_off00005e32.bin
88854dd5626fc7541940c9d948fccd729a9641e4aa78a2aa21ca973768eca29d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E32 5180 bytes
font_01_sfnt_off00006fe5.bin
d27dcc0f32b1153a4dd93560fbdce1e6abc66a75bba8a8aa21100ac196d0d372
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE5 10176 bytes