Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc39ebf3ea8db2d…

MALICIOUS

PDF

42.9 KB Created: 2020-08-07 19:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0f85ab0c387b91c61e656c25aa0234 SHA-1: 5c6f27767ad2a5b410c07285e27e4779a0caada3 SHA-256: 6bc39ebf3ea8db2de579627a8115034057bac4be08aee1a902a6570a15bedf55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, such as 'https://ttraff.ru/pify?keyword=budget+templates+pdf', are likely used to direct users to potentially harmful sites.

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=budget+templates+pdf
    • http://files.blingbyfee.com/uploads/1/3/1/1/131164130/xasosokuzeju_kapifudelofubor_fufamuzofuz.pdf
    • http://files.bellahilllifestyle.com/uploads/1/3/1/4/131452997/puzubatajemofu_fobupireb_kipaxamu_vibototiguxutig.pdf
    • http://files.aasca.org/uploads/1/3/1/3/131384489/gijewufuv_niloragajidu_fiwazuwuzuj_rokinuke.pdf
    • http://files.hollerdaysky.com/uploads/1/3/0/8/130874091/dolozagonobubameli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/rofavigexivava.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35035436777.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6695/files/branko_copic_magarece_godine.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/39119049871.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/vejulaxavofegubenefubimo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4266/6656/files/35666739078.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/bovaxebijojolizaxanuwota.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38030937597.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/98348204858.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43396058945.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/lawaxa.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_off000068bf.bin
ec23391afd7fb39ba54282a7f460e54ec8d26e744a949fc19cd9fd695364de31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 5316 bytes
font_01_sfnt_off00007acb.bin
4e2d6610800e3b6afab495f633098451188bd47f4af3e0c0c747e52350469964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACB 10704 bytes

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