Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab0ff21339fa6c1…

MALICIOUS

PDF

47.2 KB Created: 2020-08-23 14:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3f42fb687f4a7d7bebafb77a133b7b7 SHA-1: 798586cdb1e1d6a2855184e557d13861efc01ef2 SHA-256: 6ab0ff21339fa6c14d42fe4889bcd5f32967784f99c7edd0105fbdf358fa884a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a redirector known for malicious activity. The document body, though heavily obfuscated, contains text suggesting a lure related to 'basic of java programming pdf' and includes the malicious URL. The presence of numerous external PDF links further indicates a link farm or SEO manipulation tactic to distribute malicious content.

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/pify?keyword=basic+of+java+programming+pdf
    • http://savef.newdundeefireworks.com/uploads/1/3/0/7/130775818/2244229.pdf
    • http://files.ralflittle.com/uploads/1/3/1/4/131483108/lakeja-tewam-vuboramigusoge.pdf
    • http://files.aloewood.com/uploads/1/3/1/4/131408170/7a43a8c70.pdf
    • http://files.wellsmusicpublishers.com/uploads/1/3/0/9/130969655/7781075.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/64942234042.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/certificado_de_origen_mexico_japon.pdf
    • https://cdn.shopify.com/s/files/1/0437/6893/8658/files/46605458786.pdf
    • https://cdn.shopify.com/s/files/1/0431/1629/8393/files/32070357396.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5243/files/98093590790.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2720/files/winokozepuginonid.pdf
    • https://cdn.shopify.com/s/files/1/0435/8239/0435/files/14563180783.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/travel_magazine_layout.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/p90x_nutrition_guide.pdf
    • https://cdn.shopify.com/s/files/1/0462/6336/9882/files/alejo_olorun_part_2_yoruba_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/clasificacion_de_enterobacterias.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/lajefazogosidowugipaj.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062c1.bin
1e8981798106bac2d27bd798752051e8e89ae3653cee58405f3b99c53492e064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C1 5628 bytes
font_01_sfnt_off000075d2.bin
2c7741b7b3acb429222ff077c22ba641049217ad3c8f085c20b630e522a56589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D2 10512 bytes
font_02_sfnt_off000099f1.bin
36298d9b42482ef505b651e9545134b76438dad7e59d1f17d96a2cc3761d4b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F1 16304 bytes

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