Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ebf5d74513444c…

MALICIOUS

PDF

37.1 KB Created: 2020-08-08 13:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dae5898077151436192643c62194cd46 SHA-1: 7dc15d4ed17e40ad14e2ce1828c46a83a05f1dbc SHA-256: 34ebf5d74513444c78328059570268843fa296f481674a374efa41b1e2ee1c71
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external resources, which is indicative of a link farm designed to obscure malicious redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.cc, a known redirector. The document body, though partially corrupted, contains keywords related to free PDF downloads, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=english%20grammar%20tamil%20pdf%20free%20download
    • http://wegoru.americastrumpet.com/uploads/1/3/0/7/130776791/wabab-namogawemufere-borenipakof-zufeforumubu.pdf
    • http://files.riverviewchurchcoeymans.com/uploads/1/3/1/6/131606818/rigazupe_popigalegibewes.pdf
    • http://bojukal.maggiemcconnell.com/uploads/1/3/1/4/131453540/8923932.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6103/files/juwaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/wonisobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/48465281371.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/xewanasulirutakasoloribej.pdf
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/fupepoguvuxufanaladuto.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/sugidode.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/87875549670.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/dogikudogozozunuduvosad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/blessed_assurance_lldm.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/bewenedimuvutifitijefeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0320/files/lufafus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046ad.bin
34ccad6e00c1f263d905fe624e8449b6f53a5b0d607e07ad015e9ff665a4e6bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46AD 5292 bytes
font_01_sfnt_off00005889.bin
e11d6806c38bebae21b52bd550d87c91d0429c5dca6df207543e0d525b8636da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5889 9572 bytes
font_02_sfnt_off00007943.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7943 4324 bytes

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