Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0a8ad87e697c4f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-06 03:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a67506b49c5f297fe508acf57dff1bd SHA-1: 838087e8c2d7f127f8831bd6c659e2f7a0a9fb66 SHA-256: 1f0a8ad87e697c4f601ed4fa48f3a361d94140607f7939583003b85624d3f41c
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also features a large number of external PDF links, suggesting a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a lure to download a PDF, which then redirects to a malicious site.

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.ru/pify?keyword=agile+scrum+pdf+download
    • http://files.powermoneywomen.com/uploads/1/3/0/9/130968943/001c990ebc80091.pdf
    • http://files.nvgws.com/uploads/1/3/1/4/131407012/nujotodobejeg.pdf
    • http://files.homeandschoolsts.org/uploads/1/3/1/4/131437147/mopufunefizo.pdf
    • http://files.rydesouthflorida.com/uploads/1/3/2/6/132681479/c45a5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/46546495667.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/novovodunugek.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/ketonet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/27031296152.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/felakezowezupomimepoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/6790467833.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0103/files/zikenowiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/pojoribiti.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/pomalijudukel.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/uae_new_arbitration_law.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_off000062fd.bin
8c2576b799fee79f53a040c0cd406c3b5fd053646d7f5e9f93a7968185b089a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 5556 bytes
font_01_sfnt_off000075e8.bin
ed14455dfe546e818e8605c272060d0ca1ab0b9c7a7de46ae6ccfd14af1afea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E8 12772 bytes