Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3d5b356808ef00…

MALICIOUS

PDF

36.7 KB Created: 2020-08-02 12:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8e8939608ee593731364c096c5020f5 SHA-1: 5778045274cfc8d1c8f1f541d2eedf73269c7dd4 SHA-256: cd3d5b356808ef00a5c5ab82b7606b1cc62a4b3aa7754c6229002db65c7fe587
154 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 a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=discord+server+growing', is designed to lead users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phishing lures.

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=discord+server+growing
    • http://files.lms-art.co.uk/uploads/1/3/0/7/130738765/worogumokejux.pdf
    • http://files.whiteoakumc.org/uploads/1/3/0/8/130873781/xoluluxetuv.pdf
    • http://files.teamireland.ie/uploads/1/3/0/7/130738641/nakisarotute-sezeturebudo-nevile.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/derikadi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/11721000847.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/72355191894.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/7804110456.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/xerezetijokorixig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/99370616371.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/33747113151.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/motawogujomovekazadepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/principles_of_macroeconomics_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/advanced_accounting_beams_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/iptv_stalker_plus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/pafeb.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_off0000536c.bin
4d572b7f283f802d485b7239f748f2c6ca8aaaba55583c4827ae5fed39ec2539
pdf-font-stream PDF embedded font (sfnt) at offset 0x536C 5016 bytes
font_01_sfnt_off000064a9.bin
6c0e65e73f1a4a13b5b5fcbdcd057b703191bbaaeff7565c561308f4e6434012
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A9 9864 bytes