Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b66b72e9ea0b45…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 03:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c71a53b5ac445ccf80608b6668279d75 SHA-1: 7546eafdc3d3f07ab3a9de4e37c2e3d36b70ca73 SHA-256: 18b66b72e9ea0b458749c8d806ac5e7f7ee86c4863f41a3ddb23771cbeeedc24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to harmful infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=the+art+of+understanding+yourself+pdf
    • http://files.mariangelaalhanati.com/uploads/1/3/1/3/131379552/gobakepixak.pdf
    • http://files.centraldrivewayswarwick.co.uk/uploads/1/3/0/7/130740180/7590134.pdf
    • http://files.wehaul2play.com/uploads/1/3/1/4/131452838/segopiw.pdf
    • http://files.marimbaaustralia.com/uploads/1/3/0/7/130739517/pusifukifiropaxelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4388/0103/files/palubigomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/90547609085.pdf
    • https://cdn.shopify.com/s/files/1/0444/6345/6423/files/convertidor_analgico_digital.pdf
    • https://cdn.shopify.com/s/files/1/0437/8168/5406/files/28201946114.pdf
    • https://cdn.shopify.com/s/files/1/0430/7134/0698/files/wedadub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/zoneddatetime_to_date.pdf
    • https://cdn.shopify.com/s/files/1/0432/5900/3038/files/9099979453.pdf
    • https://cdn.shopify.com/s/files/1/0432/9642/4096/files/21778542440.pdf
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/risiwefexujoru.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0783/files/14312575336.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/7980262946.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/mamabowo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b7a.bin
9cd167a4bd08d0f041f5e67d5634a873c742577541c30c63ae2745c69bca9fa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 5356 bytes
font_01_sfnt_off00007db2.bin
9d8346e4d8283d09ba1a726e4bef7996b9f5e483529b851050b6d9aaa7b15988
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB2 10908 bytes