Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d8548b3061bb3d…

MALICIOUS

PDF

56.7 KB Created: 2020-08-06 11:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf432c959c9ed90d564411b3254465c SHA-1: c070e9c3a05c4fe80f8788ce251fc7039a379e3a SHA-256: 87d8548b3061bb3d5f673d4cf538923e1301f1d7393fb3f1dcd5e7fdfad67494
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body text is minimal and appears to be filler content related to networking cables, likely to mask the malicious links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of a malicious redirector or phishing attempt.

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=types+of+networking+cables+and+connectors+pdf
    • http://files.albanianamericanbarassociation.com/uploads/1/3/1/6/131606467/51bc1645.pdf
    • http://foniwada.marklasallefineart.com/uploads/1/3/0/7/130739227/fegatoza-mepafepobiwa-sekive.pdf
    • http://files.sarahelizakelly.co.uk/uploads/1/3/1/3/131381553/bbc185c5c873878.pdf
    • http://files.country-charms.com/uploads/1/3/1/1/131164093/pasolakazirule_nanexiluxate_mulosixaleke.pdf
    • http://files.jake-axon.com/uploads/1/3/0/7/130739011/dufiledop-xabowariw-tozofo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/rebowav.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6149/files/sivagumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/56662437728.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/16654998950.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/vixenetapozifuwajumub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8167/9523/files/99712557576.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/winewetizas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56966684837.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6325/files/send_faxes_from_mac.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_off00009eff.bin
0daeb00f6b5fbabc7ad4f2064898710668fdcaad1c2744c6cd38f009b577f595
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFF 5668 bytes
font_01_sfnt_off0000b26f.bin
c345bb00484510769a1e771ae8ebaaefb0544ffb6928cb0a702984fca511960c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 10352 bytes