Malicious PDF — malware analysis report

Static analysis result for SHA-256 46664665b6b20818…

MALICIOUS

PDF

39.7 KB Created: 2020-08-23 01:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc4de4d3043f4e850273ace35d6325a1 SHA-1: 55a3da3a782f1faf3b4999aa3e3bcf250fe2dd28 SHA-256: 46664665b6b2081837a477d382dbac4f816e2b6d24ee1a5eaf24a553156a1218
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a redirector service, which is a common technique for distributing malware or conducting phishing attacks. While no scripts were extracted, the sheer volume of outbound links suggests a coordinated effort to lure victims to external resources.

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=weather+killington+vt+snow+report
    • http://buvetaji.kansascityamprepair.com/uploads/1/3/1/4/131453501/bizupexebupafususef.pdf
    • http://files.maltipoos.org/uploads/1/3/1/4/131437648/rufas.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/85548381282.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/allan_quatermain_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/return_to_life_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/fewopokexi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/28686337994.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/alif_novel_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4533/files/87849656313.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/96114454732.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/24451857003.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/mawukumumuparapevusa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/disconformidad_alta_medica_inss.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/kujisezup.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_off00005bd6.bin
4b74104602da0a0cceceb6a6e1e4d24f40b9710c9b2b5649f4f3582d2852acbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD6 5312 bytes
font_01_sfnt_off00006dfd.bin
0f819d4a91d7a9b00de34a5682dcceb462e8e1830e9494b24f513dced2b1299f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFD 10580 bytes