Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6099fffadcb0ede…

MALICIOUS

PDF

63.5 KB Created: 2020-07-15 14:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2387f8ef1899a726a1c7688f2c5be6af SHA-1: f2f2505aaf981f3cefa10d2823cc70bb2fcd9149 SHA-256: b6099fffadcb0ede7598adcca8f0763fe47dd64f1cc2907f14bca0aee41f4700
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or encrypted, preventing a deeper analysis of its content, but the presence of malicious links is sufficient to classify the attack pattern. No scripts were extracted from this sample.

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.ru/wb?keyword=m%C3%A9moire%20master%202%20ressources%20humaines%20pdf
    • http://files.weliketodig.com/uploads/1/3/0/7/130739427/satojeb.pdf
    • http://files.arimasarts.com/uploads/1/3/2/8/132815731/welide-zowadoviz-tifixe.pdf
    • http://files.paroute422.com/uploads/1/3/1/4/131410094/jegasifinoluxo-rovile-lamaxaguje-pikurila.pdf
    • http://files.bigoakfarms.net/uploads/1/3/1/3/131379820/vemijorirusanepar.pdf
    • https://tovudut.files.wordpress.co
    • https://vurivul.files.wordpress.com/2020/07/xamidatani.pdf
    • https://zugebopiw.files.wordpress.com/2020/07/sekiloxizovigenobovikor.pdf
    • https://kiwuzep760592565.files.wordpress.com/2020/06/88266059921.pdf
    • https://tovudut.files.wordpress.com/2020/06/42136393875.pdf
    • https://pikudava.files.wordpress.com/2020/07/netafot.pdf
    • https://fububoxoludi.files.wordpress.com/2020/07/kenorutizozifokan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/tavubusuzebixuvowipala.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/rasolojukarogizepado.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20116177671.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/72684418598.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/fatenavovofibebifegosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/58836116516.pdf
    • https://cdn.shopify.com/s/files/1/0432/7279/8373/files/23008278468.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.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_off0000b4d7.bin
e9562691b99a8114fc4e26a7b23df88003d9124f1b7f1c4e967a54256ec652cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 5524 bytes
font_01_sfnt_off0000c733.bin
353ca0b18198f4e47e6e17dd45b664a3467de762b3915a0a201c140f4dc9e59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 12668 bytes

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