Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd3ac0e58b41336…

MALICIOUS

PDF

33.1 KB Created: 2020-08-19 18:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 094dd95485a8b4eeb21b039ec7a70446 SHA-1: 150d541daedca8cc626d1fe81e0387c4f7c16595 SHA-256: ffd3ac0e58b4133674ddd64b1019664648cbb6266252fc790d6fdae0bdd39f8a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body text is largely unreadable, but the presence of the malicious redirector and the link farm heuristic strongly suggest an attempt to lure users to malicious sites. No scripts were extracted from this sample.

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=beaufort+county+school+uniform+colors
    • http://miwoxe.fishbowltx.com/uploads/1/3/1/8/131872203/gidixexitifotofumif.pdf
    • http://files.dlitefulchocolat.com/uploads/1/3/1/4/131437832/e39e390bcdd639d.pdf
    • http://files.floridaseniorcenters.net/uploads/1/3/1/4/131453302/2293478.pdf
    • http://files.spanishfluencyacademyforyoungsters.com/uploads/1/3/0/8/130814575/gapil.pdf
    • http://files.bobbycarpenterllc.com/uploads/1/3/1/4/131437725/1b91e91814f0486.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/15650118848.pdf
    • https://cdn.shopify.com/s/files/1/0432/7050/4608/files/ponujufare.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/simple_file_upload.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/dutogarafikon.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/wasufifemonebeliwemit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/39123869600.pdf
    • https://cdn.shopify.com/s/files/1/0437/0389/4171/files/building_construction_by_mckay.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/35205361614.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/vevaguzageked.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_off00004537.bin
3e121c77247e9e84decc356a4013e7b840fe14fce7007a97ee257272cb9e703a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4537 5272 bytes
font_01_sfnt_off000056fd.bin
281f1248ae4ef6e6616fb0f245acf86a6a2d9754d33d2c51d8d8163718d880b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x56FD 9520 bytes