Malicious PDF — malware analysis report

Static analysis result for SHA-256 871aae288b6587b5…

MALICIOUS

PDF

50.3 KB Created: 2020-08-11 16:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc18c00c81c840e2bb355535a3d5580 SHA-1: ce73ecb694e1ed1f8f1fd01771e3898375da8f52 SHA-256: 871aae288b6587b57cfe9e0554ee43edb8fcf81bbee2780091cbcc33d0d277db
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. The presence of numerous external links, many pointing to potentially compromised or malicious domains, suggests a campaign to drive traffic to harmful sites.

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=shareholder+theory+pdf
    • http://mujebimit.spcwelding.com/uploads/1/3/1/4/131483254/zegutixikofa.pdf
    • http://files.drdavidmilanovich.com/uploads/1/3/1/6/131606118/10aee9e4d2.pdf
    • http://files.morrellnaturesanctuary.ca/uploads/1/3/0/7/130738569/5963768.pdf
    • http://files.kerrybaggott.com/uploads/1/3/0/9/130969115/denupob_guzinulit.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/14944967668.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/38628105511.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/79671976372.pdf
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/objetivos_conceptuales_procedimentales_y_actitudinales.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/90768525191.pdf
    • https://cdn.shopify.com/s/files/1/0434/3054/3512/files/muxekelidugadumugefunebot.pdf
    • https://cdn.shopify.com/s/files/1/0433/1349/6222/files/pofesojexobosipilepopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/pisikujebajogibaposofi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/10256027528.pdf
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/sudejolemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/99913039345.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_off00008782.bin
f1c75b1efa2644be8a42c1ae63dde8af8f5cda00d7864d3772d40b2d5e776d95
pdf-font-stream PDF embedded font (sfnt) at offset 0x8782 5156 bytes
font_01_sfnt_off0000990d.bin
71d526485617be2f97ae6ff3dbe1f3c44849dbde1bc54b4379fdf734c0d3ec4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x990D 10356 bytes