Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e117745b36c20e…

MALICIOUS

PDF

33.1 KB Created: 2020-08-12 09:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f0f5629f2373c9e1d807b1c9c5da93d SHA-1: af8252dd7dd676d3fb8f391e1269f0021e233c39 SHA-256: d4e117745b36c20e259c012d65889be742aedda2a8fe6ec387cf271cc45c6754
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://ttraff.cc/pify?keyword=silent+letters+exercises+pdf, is identified as a known malicious redirector. The document body itself is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking the links and visiting potentially malicious sites. The ML classifier strongly supports the malicious verdict.

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=silent+letters+exercises+pdf
    • http://files.nscwritingcenter.com/uploads/1/3/0/9/130969206/lifuxenogim.pdf
    • http://tunil.lcooperillustration.com/uploads/1/3/0/7/130739751/6de52b4e53f3776.pdf
    • http://fimoro.pahasapagrotto.org/uploads/1/3/0/8/130874365/lemowosozexirapalala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/anthony_giddens_runaway_world.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/fijafitopusoroke.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/73759687308.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/86960484934.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/xexizokesavevuwuderozekuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/dotuvup.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/82409637822.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/sativuvibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5745/files/49241832877.pdf
    • https://cdn.shopify.com/s/files/1/0434/8739/6004/files/advanced_piano_christmas_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/junabuserifezenide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1447/files/philosophical_gourmet_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/ruxofudezejoveseki.pdf
    • https://cdn.shopify.com/s/files/1/0440/9052/3813/files/wevefemowidoxorigevizo.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_off0000464e.bin
d39b88d1c66439a1bd539931bd70a59dbd65ec7638179e8fe7e829c4ce3bf54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x464E 5112 bytes
font_01_sfnt_off000057bc.bin
b4ca4f7b6c541efef32379d04e0748445e29238ddb719596a84e6dfb36bcca8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57BC 9500 bytes

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