Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a3dd3cdcc69e3f…

MALICIOUS

PDF

42.9 KB Created: 2020-08-12 17:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17cb69280886ef7df46fec2112be5bb2 SHA-1: f0f9fba2e0c6b9b2e95201df3897961cb4d85ff4 SHA-256: a6a3dd3cdcc69e3feee518e76046f4e476c4737137196149ab008b6136380dff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to either manipulate SEO or redirect users to malicious sites, as evidenced by the numerous Shopify links and the ttraff.com redirector. No scripts were extracted from this sample.

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/pify?keyword=aranhaverso+hq+pdf
    • http://binepiri.cuckoostudios.com/uploads/1/3/0/8/130874493/lirumuf.pdf
    • http://files.secondhandlife.org/uploads/1/3/0/9/130969705/72c2b3c.pdf
    • http://files.pilsefestchicago.com/uploads/1/3/1/6/131606789/bujozobon_jijiz.pdf
    • http://files.palestinewildcatfootball.com/uploads/1/3/1/8/131857565/gafipevalu.pdf
    • http://todotu.sirocksny.com/uploads/1/3/0/7/130775734/fufojotel-kuzegefedewaf-kodanoxororejab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4481/4500/files/dolaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/tuboxujiperonol.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/70095957905.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/sedubuvaseleki.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8554/files/11056707744.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/87826252696.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3931/files/josezu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/32893019831.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/82831699450.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/todusetomulapefewodigalek.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/zafokebewazokawobowuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/5615/1190/files/charlotte_s_web.pdf
    • https://cdn.shopify.com/s/files/1/0440/8567/4149/files/368755270.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/pinuxevonuxeveweromewiwa.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_off000067b1.bin
08bee0b8e8595b3afb42ed11c3d0397a6b7d40135bc33f7abb3afb4bce893507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 5272 bytes
font_01_sfnt_off00007994.bin
0bc8a666eb68c814d857b23ea9f44ef00fb7a4cf1488150b05bde6316472141b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7994 11456 bytes

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