Malicious PDF — malware analysis report

Static analysis result for SHA-256 883f7b0ecfaf7751…

MALICIOUS

PDF

57.3 KB Created: 2020-08-21 03:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e765aa8af08e571bfe2d9e2cb79d7f7f SHA-1: a8e68f9d768bef0129c12466c4757d53339dee3e SHA-256: 883f7b0ecfaf77511e71586dccd9c889ddf84ab25989edfc03bebee468ab5ee8
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, another critical heuristic identified a mass external PDF link farm, with many links pointing to cdn.shopify.com, likely for SEO manipulation. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links, one of which is a known malicious redirector, suggests a phishing or malicious redirection attack pattern.

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=rog+strix+x470-+i+gaming+manual
    • http://jojaf.theskivviesnyc.com/uploads/1/3/0/9/130969656/norobatagoxivi-zubojopilup.pdf
    • http://wuvinak.laharpelibrary.com/uploads/1/3/1/6/131606758/51554c4f97e.pdf
    • http://files.7625400.com/uploads/1/3/0/7/130776449/6602464.pdf
    • http://files.oshamaizeherbal.com/uploads/1/3/2/7/132710797/rupikilujaden.pdf
    • https://cdn.shopify.com/s/files/1/0437/8417/5773/files/trustworthiness_in_qualitative_research_definition.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/83558473374.pdf
    • https://cdn.shopify.com/s/files/1/0437/5733/8776/files/list_of_appointments_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/5332971717.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/woxobakej.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/ramij.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/paramikido.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/49097107277.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/46930234687.pdf
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/birav.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/56878035237.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/
    • https://cdn.shopify.com/s/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a18f.bin
0c9cb65dbf176cc3ee457e59a389bcc0b86ab9f63867c130627d670d8a41db8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA18F 5420 bytes
font_01_sfnt_off0000b3fc.bin
3a3d65d8ca2a14349f5bfa5f894f68212ca76a25fe1adda453b124c179ee73c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FC 10560 bytes