Malicious PDF — malware analysis report

Static analysis result for SHA-256 0555b64b9cf10473…

MALICIOUS

PDF

52.3 KB Created: 2020-08-08 18:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f70065766743d0b934179d721c8b05 SHA-1: 66f9674886e422560442531ce6a563b74cb6f532 SHA-256: 0555b64b9cf10473c29568f51f3424f0282c797fcf96768799d6f127ca632bbf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is likely intended to lead the user to a malicious site for phishing or further payload delivery.

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=ajax+programming+with+jsp+and+servlets+pdf
    • http://files.gremassagetherapy.com/uploads/1/3/1/6/131607943/xugufubaruwuke_tajezamofu.pdf
    • http://files.reviveevents.net/uploads/1/3/1/4/131453005/digekopu-wipaligifutezol-nomesizezax-dapozetevawami.pdf
    • http://files.whstesting.com/uploads/1/3/0/7/130775506/6728fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gikari.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4602/files/46866104003.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/78986249290.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/autoresponder_madness_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/11261092404.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/epic_conor_kostick.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/vanixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kesutuzijakakewinepubad.pdf
    • https://cdn.shopify.com/s/files/1/0437/5724/0478/files/39384658765.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/algorithms_jeff_erickson.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/kexulebuvemuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/57849999954.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/xijesapaxisopuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/65216529449.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cff.bin
ddf1dc0cdb1d79027a857ef73cca59fc0ffd23bcd91fada5e9d762aed8f82f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFF 5528 bytes
font_01_sfnt_off00007fbc.bin
9cbe3e91dfe2f345415d0238094dccf4f983c8f6e2380704c502ed2188758190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBC 16660 bytes
font_02_sfnt_off0000b390.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB390 4324 bytes

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