Malicious PDF — malware analysis report

Static analysis result for SHA-256 965ec7a930f4055a…

MALICIOUS

PDF

48.2 KB Created: 2020-08-02 10:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b05eb7adec95275812ae4517febc5a SHA-1: 605d62fcb95b7d72c811918ff04f2b9c198495ef SHA-256: 965ec7a930f4055ae9e060302aa05fa20817753f4265dfc5cbf78b16e5dcda43
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'rimworld' and a URL that appears to be a lure. The PDF_SEO_LINK_FARM heuristic also indicates a large number of external links, suggesting a link farm for SEO manipulation or distribution. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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/pify?keyword=how+to+fix+rimworld+1.+1
    • http://files.activeinthemiddle.com/uploads/1/3/0/7/130776183/8e696260bff8.pdf
    • http://files.adamkk.com/uploads/1/3/0/8/130815437/17b5e01ce.pdf
    • http://files.anxietytreatmentqueens.com/uploads/1/3/1/8/131856005/996602ed0d39a.pdf
    • http://files.tudorinteriorblinds.com/uploads/1/3/1/4/131406827/5e7c4791.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pinabazebovo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/85174636442.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/86228542614.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/kebujepurase.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/60033056784.pdf
    • https://cdn.shopify.com/s/files/1/0434/7173/2889/files/4705469452.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/84694460580.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/19455163592.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/18279043571.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/todexarim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a43.bin
732a1f1ddae98f8195ee377262dca3b534ba4980a65e8d1cc98970987dda9a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A43 4868 bytes
font_01_sfnt_off00007ad6.bin
92121abfdbd2eb222d120fc41164dc7a24ce0ec4a3014bd3d46f8f2d3bfd1ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD6 10400 bytes
font_02_sfnt_off00009e54.bin
21d2c517cc0d2781f643886744ab2248bbe8d92ed1ab736cc2ad748918d5c6f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E54 16296 bytes