Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72c75297e58d041…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 10:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5a4bc643711d36f83d7d507788ed5f SHA-1: d739e39216ea611bc33665c4c2159c814cd7cecb SHA-256: b72c75297e58d041937b2b9e6adf5ed804760315ce13f85a6db3cdf2ad9bbc04
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to known malicious infrastructure at 'ttraff.cc'. This indicates a phishing or redirection attempt, likely to deliver a second-stage payload or lead the user to a fraudulent site. 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.cc/wb?keyword=gate%20geology%20notes%20pdf
    • http://files.natur-ally.org/uploads/1/3/0/7/130739537/kuvilaxejumagiteriro.pdf
    • http://files.jenvie.com/uploads/1/3/1/8/131871535/tudumep_tujemi_nunifewajigo.pdf
    • http://files.econia.co.uk/uploads/1/3/2/7/132712235/lexow.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/vogezebuwiwelepewusimilow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/70388285084.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/damodaran_committee_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/fuvebopasubipinowov.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/ziteze.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/dapage.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/51039073356.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/ethnography_and_ethnology.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/79852808589.pdf
    • https://cdn.shopify.com/s/files/1/0429/2660/4447/files/raritexarosojajitu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/74401145152.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/kokisa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/fudor.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_off000060e1.bin
169827f64ffba327b8b8d3a9e6a7e3d00c8b1a97221e540405d1de4593bf4bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 5248 bytes
font_01_sfnt_off000072e3.bin
6a41d792112dfbf54d1f16beacdfe5f29597063ac379a9b3f9dc68aeee128d43
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E3 10628 bytes