Malicious PDF — malware analysis report

Static analysis result for SHA-256 238897058adb0a27…

MALICIOUS

PDF

32.9 KB Created: 2020-08-13 11:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2685898f09d64d728539ac1013ddc3 SHA-1: 306981cd535207f2ae12f320fed4395fe29870d2 SHA-256: 238897058adb0a2746f33374a6dc23efafca463d99b659f95459672c1c66728f
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One prominent link, 'https://ttraff.cc/wb?keyword=gigabyte%20h61m-s2pv%20manual', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a Gigabyte manual and the URL, indicating a lure to trick users into clicking the malicious redirector.

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=gigabyte%20h61m-s2pv%20manual
    • http://tixesozol.rn-photo.com/uploads/1/3/1/6/131636612/1d3fb434.pdf
    • http://savobak.rubysguns.com/uploads/1/3/2/7/132740214/jizejozaguropufaf.pdf
    • http://xefovevin.frankfarina.net/uploads/1/3/1/8/131856158/nozuwo.pdf
    • http://januvikoz.sovsex.com/uploads/1/3/0/9/130969059/poduzox_vabem_lalivaduxexa_xiguxod.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/99301479515.pdf
    • https://cdn.shopify.com/s/files/1/0434/7419/0498/files/voxuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3598/files/pikata.pdf
    • https://cdn.shopify.com/s/files/1/0435/2271/9912/files/atkins_fisico_quimica_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/64060947205.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/dufovosawumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/77475592594.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/10960744969.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/jajupa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1903/2987/files/wekegomipobilusijof.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/85905706755.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_off00004290.bin
6e46c6b84b35dd2e097b0209bdbf925296d773898466a6cc91bb329b4e4ca58a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4290 5840 bytes
font_01_sfnt_off0000567e.bin
6ce56913f0f068be0dcf46ffc663aa7c7f9ac4317ecd3e214a7130600d20d1a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x567E 9624 bytes