Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc303357013cf88…

MALICIOUS

PDF

44.3 KB Created: 2020-08-06 12:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8d050e20bc0457977b79ed890da06c SHA-1: c666e029cf410d13ba954fc822ec4b3e43c42dfa SHA-256: 9fc303357013cf88e187eb462c1318436d5bd2062d6327cd1b35250d1cfa599d
152 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 document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious sites via deceptive links within the PDF.

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=algoritmi+cubo+di+rubik+3x3+pdf
    • http://files.brazosmetaldesigns.com/uploads/1/3/1/1/131163859/kekamowivebi.pdf
    • http://files.yanka-online.com/uploads/1/3/2/8/132814791/vilos-wonuzisenejawe.pdf
    • http://files.arcturusfoundation.com/uploads/1/3/1/4/131452840/rezarara.pdf
    • http://files.maryellencarsley.com/uploads/1/3/0/7/130776821/9081375.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/sublime_text_3126_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/ser_bachiller_preguntas_y_respuestas.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/wezejizuwamufos.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/39480799543.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/9519976749.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zovoxumaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8172/files/11950240358.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3639/files/tutiwezudukit.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/82589751264.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5193/files/bigulovarelesepikepoxidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/jifawoninugapesexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/class_d_water_license_practice_test.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_off00006f4d.bin
cb1a821651c68ea39fdb797ad74b321024a315e13fc49eef54daae7f2490c40d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 5512 bytes
font_01_sfnt_off00008202.bin
52b2063580ae4c6fffcae65296bb6adb0ecb8a3af29076dd8c1223bf93e333fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8202 10008 bytes