Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8420650de99c21…

MALICIOUS

PDF

46.7 KB Created: 2020-07-31 04:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1796a212ceea80e6367993b55bf2a676 SHA-1: f84739294ff0722ea801c5ae211ef35da3e7eef7 SHA-256: 5b8420650de99c2150f9d657d0823be5f0f27f744114b47870120dea7b0bcf7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/pify?keyword=chromatography+questions+and+answers+pdf'. This URL is likely used to redirect users to a phishing page or a malware download site. The presence of a large number of external PDF links further suggests a link farm or SEO poisoning attempt 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.cc/pify?keyword=chromatography+questions+and+answers+pdf
    • http://files.crlangille.com/uploads/1/3/1/8/131871994/6274082.pdf
    • http://files.northernpharmacy.net/uploads/1/3/2/8/132815123/ritaruvugolakogex.pdf
    • http://files.pennjournalconlaw.com/uploads/1/3/2/6/132682694/bawibixijuzawo.pdf
    • http://files.paperprinces.org/uploads/1/3/1/0/131070845/xiluduxubezasojubu.pdf
    • http://files.midsouthflute.org/uploads/1/3/1/3/131398324/moniguzeweba_sanirodigasolaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/91506481509.pdf
    • https://cdn.shopify.com/s/files/1/0429/4167/7731/files/11500996390.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/davawuwugevogurud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/vuwivoxid.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/lomuzu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/88992754293.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/98296259547.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/97646060434.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevola.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/kapovugeretomogeronex.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/54241501963.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fawalonilon.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_off00006ee0.bin
66dfaa807fb67029dfda511ed44ba8f06ec88e96fd396d8e75cb52224761c983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE0 5648 bytes
font_01_sfnt_off00008209.bin
44d515f5e8b0002c771be7d34da8ab49c1350f099f1c2364d70b7946b9e9dd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 14008 bytes

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