Malicious PDF — malware analysis report

Static analysis result for SHA-256 64016a704be7c4e8…

MALICIOUS

PDF

43.8 KB Created: 2020-08-11 08:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bd1f967614ff7a41e4d50dadb3b9050 SHA-1: 51805fef02d1e90ad3c47a5fd238c3396a784d01 SHA-256: 64016a704be7c4e8ee517399c6e07628ceb369abbdb9d335b08605e0bebc225b
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 pointing to external PDF files, characteristic of a link farm. One of these links, https://ttraff.cc/pify?keyword=literature+review+on+employee+absenteeism+pdf, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also 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=literature+review+on+employee+absenteeism+pdf
    • http://files.busterbledsoeband.com/uploads/1/3/1/4/131454345/1938701.pdf
    • http://files.unionists.org/uploads/1/3/1/4/131453060/f383e0529.pdf
    • http://files.cynthiastarrheartspeak.com/uploads/1/3/0/8/130814298/lunedil_bedimowapeter_didoje.pdf
    • http://dizijifub.themooryouknow.com/uploads/1/3/2/3/132303382/wadumerumoselif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5025/3979/files/thyroid_hormone_regulation_of_metabolism.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/79579408005.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/40244287472.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/86203990047.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/japorekuvenowigaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/magirum.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/94448730260.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/34844429616.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/rebaxekimilazubugad.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/30054535957.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/nidanidapevejos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/45659446635.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_off00006ab6.bin
1b92af91818dc2eb7cb940d37f2ff5555f8094ef45e4417ac12160604844e6b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB6 5524 bytes
font_01_sfnt_off00007d78.bin
93b19caddfb9dd328d6600556d86c65d6bfdc8786a542c3fe2393b980f14cd3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D78 10580 bytes

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