Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1c6bfbae399a37…

MALICIOUS

PDF

40.4 KB Created: 2020-08-10 05:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec8e6fcb99cb4c249e941f6c3b808e05 SHA-1: fa6a416294d7df0360a7dc0f8a788160ca454e38 SHA-256: cd1c6bfbae399a37a913431ea04a39cc7d74f16efee5155a2d6b2b9724274998
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

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=pneumatic+servo+system+pdf
    • http://files.nishidaexpress.com/uploads/1/3/0/9/130969312/9816582.pdf
    • http://xoxanu.bloomfieldhillsskiteam.com/uploads/1/3/0/7/130776031/9cf507489b30f.pdf
    • http://files.goingcrazyinthegreenmachine.com/uploads/1/3/1/4/131452778/35ad68879d7.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/99234334240.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/tigir.pdf
    • https://cdn.shopify.com/s/files/1/0434/8130/1158/files/6589794886.pdf
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/83381166361.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/mogenutixat.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/historia_clinica_psicologica_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/94791341162.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/sifusizelukanejosami.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/bodarulorupirikukud.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/vologagekiluli.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_off00006153.bin
fb8162bddd2dbd8442abc791428f99058833d03c227e6e3aa15dcc354c5a627d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 5432 bytes
font_01_sfnt_off000073c3.bin
ecb5e697131b3072c650593f9c404e9642ee8a03f26c11cd057f6dc67894374a
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C3 9816 bytes