Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92b9ac3f231f1b6…

MALICIOUS

PDF

58.2 KB Created: 2020-08-04 01:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9edbd2c1434f26f2928c20e36dbe84 SHA-1: 49860067d12ef0284a3e1ce12b0a0231be6d0153 SHA-256: e92b9ac3f231f1b67b45cced7845e1e4777e1c45c21e02ef1623bc456523d293
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=bwv+125+pdf, which is likely used to redirect the user to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm intended to obscure the ultimate destination.

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=bwv+125+pdf
    • http://files.daniellechopin.com/uploads/1/3/0/7/130776336/920200.pdf
    • http://files.saltspringeasterarttour.com/uploads/1/3/1/6/131607321/4c9d1a8a6d78957.pdf
    • http://files.flattailpress.com/uploads/1/3/1/3/131381150/ba3554881a1.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/luwubiketudopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/xalijin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/56038340038.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6904/files/80243502606.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/84600053018.pdf
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/soxeliwoginobuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/40939508025.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/gebidiwemodujilal.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1809/files/bible_commentary.pdf
    • https://cdn.shopify.com/s/files/1/0437/9957/6733/files/83918271535.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/71281852240.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3203/files/17487411611.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2374/files/jipavisotubimoxubowuk.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_off0000a23d.bin
f836b5757a20017b91aab30e9898335125fb73f3a1a575d526c05601ceef94b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xA23D 5028 bytes
font_01_sfnt_off0000b39d.bin
a0f39d4d8895b46f7ca0c629076be36648f76b0f1f3a630562db3a62a1b73fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 11744 bytes