Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f0cab318c71a93…

MALICIOUS

PDF

34.4 KB Created: 2020-08-07 07:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d8304924a05f2469debb79c9abf724 SHA-1: fcedc989b8f3cd8642dcad1b9e7ff3dfc63e65ac SHA-256: a6f0cab318c71a93f39e88040c23d145195aae924e608217fb9c46fd41f2fb7f
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate educational resources, but the primary link redirects to a known malicious redirector. This indicates a social engineering tactic to trick users into visiting malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=cambridge+checkpoint+mathematics+practice+book+8+answers+pdf+free+download
    • http://files.lashbar.life/uploads/1/3/0/7/130739190/8230269.pdf
    • http://files.ascendwellnessgroup.com/uploads/1/3/0/7/130775701/rivetip_voxilazosafawif.pdf
    • http://files.lco-team.com/uploads/1/3/0/7/130776200/vupowilono.pdf
    • http://files.earthartbalance.com/uploads/1/3/1/4/131453329/nikabiz.pdf
    • http://files.jeujeulafoille.com/uploads/1/3/0/7/130776120/8ba030.pdf
    • https://cdn.shopify.com/s/files/1/0428/4429/1228/files/a_week_in_winter.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/schedule_3_balance_sheet_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/xozomev.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/majafonoroxemudor.pdf
    • https://cdn.shopify.com/s/files/1/0429/4954/2041/files/92213538669.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/64662009747.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/92865092513.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/44948541195.pdf
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/sling_psychrometer.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/zutijofutudujig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/xizotasabuporikavolimu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2956/7387/files/pokumitaguzavafivovaxota.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/wevotubivelulukobajolu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/satufokamonig.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_off00004890.bin
d29013822bb258e60c460d302bb8d56178d126ca3eff52f2fca17afbd6c8adc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4890 5964 bytes
font_01_sfnt_off00005cb9.bin
8284ec3b26200f4e024f66b330fe4e8ee95bade6e6fa6fd23734567ab8c6744c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB9 9072 bytes

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