Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74828bc1a5b1cd9…

MALICIOUS

PDF

32.3 KB Created: 2020-08-29 15:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f3a47e9406cb63bd8727fa09f7fe5d SHA-1: 0d1eab1e54124071797816bdaac4e1de69447b28 SHA-256: d74828bc1a5b1cd9a2aba90bb764bf8b7e673960d42ea44f08c71cb6f32fc20c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.com). This indicates a link farm or redirection attack pattern. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector URL is a high-confidence indicator of malicious intent.

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.com/wix?keyword=practica+elaboracion+de+chorizo+espa
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/luwajotapaxedorume.pdf
    • https://cdn.shopify.com/s/files/1/0439/1033/2571/files/singer_sewing_machine_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0443/2723/9836/files/beginner_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9057/files/kpss_tarih_bilgi_kartlar.pdf
    • https://cdn.shopify.com/s/files/1/0437/6608/7832/files/wukajurosowaxovewuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1562/files/44120877330.pdf
    • https://cdn.shopify.com/s/files/1/0428/9491/7799/files/marodakamovojom.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/5e_oath_of_the_crown.pdf
    • https://static.usrfiles.com/ugd/b8c837_12eb73f1113a465d906497cf408704f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_de375d03be5b4531aae2a3e01fc7263c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bad49abe751b4e6fbf4d31c8e0ebd9e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4959977fc9ad409686fdf6bc0d5cf32e.pdf
    • https://static.usrfiles.com/ugd/b8c837_020fe300be4e4cbbadafe8ae2b3033d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f647410999b54aa7bdbb06b87dd16016.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_off0000429a.bin
7f27009b359f5679eeff90ee7b6bd6bd852f9592b81479f231bb294f1cd0e31a
pdf-font-stream PDF embedded font (sfnt) at offset 0x429A 5352 bytes
font_01_sfnt_off000054b0.bin
00fb8a54cd7f6c4020113493fa945c6a3a73ea22aabc4a9121b6e04b0b9f59bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x54B0 9196 bytes