Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9d9c285dbd3601…

MALICIOUS

PDF

48.1 KB Created: 2020-07-30 23:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7596917d728c6a28e6a40097c0e209b SHA-1: 2434def95d3e4cdab9df32855003c1af67b08e96 SHA-256: 5f9d9c285dbd360114ba7e49ee9b7ff34f05f130a968af5731be4ee534113c3b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead users to harmful content. No scripts were extracted, but the PDF structure itself is indicative of a link farm attack.

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.com/pify?keyword=development+planning+in+nigeria+pdf
    • http://files.bigislandghosttours.com/uploads/1/3/2/3/132302759/4390147.pdf
    • http://files.sunleyphotography.com/uploads/1/3/1/4/131483327/zijazarin.pdf
    • http://files.vaporstopgreenville.com/uploads/1/3/2/6/132681617/86ae25f75b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8448/9631/files/nuviwuzetegogunabavonobip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/58985026680.pdf
    • https://cdn.shopify.com/s/files/1/0434/2893/7880/files/73459143457.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/93912899033.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/20269625834.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/16383154737.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/bepoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/bojatobapotamuwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/52576456470.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/87932664667.pdf
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/62582400884.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/wajosofumikid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/2453704056.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e87.bin
e2157e93be0ab51df0fa27e25a1a3dace22bd97306f58e1ab213566d021e84e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E87 5028 bytes
font_01_sfnt_off00008f8f.bin
7bc8eef669bde58ac878421f2a16600dfce0ee9a90dfe55e1fc8b5d17fac6212
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8F 10404 bytes