Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c891ece0679a15…

MALICIOUS

PDF

50.6 KB Created: 2020-08-17 01:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d2d61bc7b3a0f697022eb1a87375cb2 SHA-1: 289506164fb701806c022346f1409073cd3482bd SHA-256: 63c891ece0679a15e32043abdece47cff32b0aa4536b4d559d3a57b47e6a3fa4
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host malicious content. One critical finding is a link to a known malicious redirector, https://ttraff.ru/pify?keyword=carprog+5.+94, which likely serves as the initial stage for delivering a payload. The document body, though partially corrupted, contains references to 'Carprog 5.94' and 'wkhtmltopdf', suggesting a lure for software downloads. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ru/pify?keyword=carprog+5.+94
    • http://files.shipshapetipsboatbulidingandrepairs.com/uploads/1/3/1/4/131406507/13e7c8cf25.pdf
    • http://files.westakronfamilydental.com/uploads/1/3/1/1/131164202/f5fa509253d6.pdf
    • http://files.humactive-formation.com/uploads/1/3/1/4/131453219/2fc36293960dea2.pdf
    • http://jefoli.havehopeforthejourney.org/uploads/1/3/1/8/131857090/6283688.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/womipivizivimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/78283663198.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/28080050762.pdf
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/56473630103.pdf
    • https://cdn.shopify.com/s/files/1/0435/9507/1651/files/meningoencephalitis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61286624564.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/91646805173.pdf
    • https://cdn.shopify.com/s/files/1/0432/1922/2687/files/sabuxometavomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/noroliwafav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/85332214981.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a41.bin
a41a1819d3736fd56db90bdb7325e2280b77f89baf0eca17d0fb16c83d6e6977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A41 4636 bytes
font_01_sfnt_off00007a12.bin
10d371a381728983bdbb3aa432a87d6a5922c3d47dae0365724d633a3b0831d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A12 16676 bytes
font_02_sfnt_off0000ad6f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6F 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.