Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e0d1655353b20a…

MALICIOUS

PDF

44.3 KB Created: 2020-08-19 23:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090f031a1d8f7c91c6428ba820bf04bc SHA-1: 74027517a49bcc956adbbb50e1969991cc27f138 SHA-256: 71e0d1655353b20a69ed26b2ae38af75d7447f682fabeaafac7f6246605307cc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body also contains a direct link to this redirector, suggesting an attempt to drive traffic to malicious sites under the guise of providing game information. The ML classifier strongly flagged this PDF as malicious.

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=barbie+games++offline
    • http://files.jbhcrafting.com/uploads/1/3/0/8/130874220/melozazijisajifor.pdf
    • http://files.hemstreetllamas.com/uploads/1/3/1/4/131453944/tumanefesaler_pewuvoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/12524351945.pdf
    • https://cdn.shopify.com/s/files/1/0441/2188/2776/files/back_off_song_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6832/4005/files/dituga.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/a_forma_da_agua_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/63201008771.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/megit.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/27048499569.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1453/files/gurasidid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/76787118515.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_off00007067.bin
101bfa5248ed23f187f1c4f31af9697ddb0b73621fafe3e73ed5b016489b38d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7067 5276 bytes
font_01_sfnt_off00008243.bin
37c86bb2baa2f10c6d1895ec7e85b1196d67feb7ec8e228a6cc066cd613ddf15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8243 10024 bytes

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