Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ff8263d429501e…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 01:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4eebca877438d5ef2580fcf851a710a SHA-1: 749743fa8df7da8296ddd0325960485d5bf7964d SHA-256: 12ff8263d429501eeacf9ae9dbdd806692e82b5415007b6295d5ed494ea3cd87
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous embedded URLs, including one that redirects to known malicious infrastructure. The document body text mimics a search result for a PDF, likely to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=descargar%20padron%20electoral%20cordoba%202017%20pdf
    • http://files.turnerchristianacademy.com/uploads/1/3/2/6/132682239/dofirawosefalofugu.pdf
    • http://files.wallingfordmuseum.org.uk/uploads/1/3/1/1/131164567/nesop_niwote_gavapogafun.pdf
    • http://files.the309s.com/uploads/1/3/1/4/131406403/549cc8da02c5b3f.pdf
    • http://files.waldenfollies.com/uploads/1/3/2/8/132814906/251544.pdf
    • http://files.concoursllc.us/uploads/1/3/1/0/131070618/4456516.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/jalelevusapotuvubemofovip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8167/files/ledimexijifunusemomasog.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/sedesudanelewatugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/casio_fx_95es_plus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/53441990421.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/97741316284.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/managerial_accounting_asia_global_edition_2e_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/sefewarison.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/organic_chemistry_notes_class_12_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/vasoj.pdf
    • https://cdn.shopify.com/s/files/1/0447/0338/3708/files/zozadutesisoxitekebi.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_off00006f23.bin
aa8459c9f7af37157e302c04f047d01802a3fe3b265d034a165ca27889e86b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F23 5868 bytes
font_01_sfnt_off00008337.bin
4586d9109ecc6b852ace9c875ec89dc320432a5ec0944dc4d1bb2ae96b3d3f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8337 11276 bytes

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