Malicious PDF — malware analysis report

Static analysis result for SHA-256 cece6d9ba2118134…

MALICIOUS

PDF

42.1 KB Created: 2020-08-17 07:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c22f27874262fc52fb5bdf1a2a3db0 SHA-1: 554b253e111a9c4f1a2e43c02a7c61c2e37f0fcb SHA-256: cece6d9ba2118134a54ce581462b2bb859fb26a21660564db151dd8aa83882a9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The document appears to be a lure, using the text 'Mathematics teacher cv pdf' to entice users to click the embedded link. This link leads to a redirector, which then likely directs the user to a malicious site or payload. No scripts were extracted, limiting the analysis of further execution steps.

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=mathematics+teacher+cv+pdf
    • http://files.emersymons.com/uploads/1/3/1/4/131411688/kanidag.pdf
    • http://mimik.bereanabf.com/uploads/1/3/0/8/130813557/4a50c.pdf
    • http://zoxup.goddessartscollection.com/uploads/1/3/0/8/130814328/4874587.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2323/files/31328897813.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/16003118003.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1542/files/convert_gb_to_mb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/hotel_formule_1_paris_bagnolet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/usmc_scout_sniper_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/50805708850.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2137/files/rurujatemebekijevave.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/zojojenizedegowekusazane.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/womakoxekumog.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/93785208011.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9927/files/algebra_2_honors_florida_textbook.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_off00006559.bin
4fc924d59f8e42247084f791b92801b32d6bcab5aee7b26cf46943102b74f52d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 5428 bytes
font_01_sfnt_off000077b4.bin
2b31b72ae06258e4d5efeae5cad16a3c8a16c944447306e1169b13ad1fbd22e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B4 10696 bytes